Our Leadership

Larry Renfro

Chief Executive Officer

Larry Renfro is chief executive officer of Optum, UnitedHealth Group's health services platform, overseeing OptumInsight, OptumHealth and Optum Rx. Renfro joined the company in January 2009 and has served as chief executive officer of the public and senior markets group. He worked in the office of the CEO at UnitedHealth Group coordinating projects in new areas of growth and development.

Renfro was formerly a senior executive officer at Fidelity Investments and a member of the Fidelity Executive Committee. He was president and chief executive officer of AARP Services, Inc., before he rejoined Fidelity in 2008. Renfro has also held senior executive positions at NewRiver, Inc.; State Street Bank & Trust; and Allmerica Financial.

Paul Bleicher, MD, PhD

Chief Executive Officer, Optum Labs

Dr. Paul Bleicher is Chief Executive Officer of Optum Labs, an open innovation center for the health care industry focused on improving patient care. Dr. Bleicher leads collaborative research and development efforts with partners from the medical, academic, life sciences and government communities who are committed to driving improvements in the delivery and quality of care.

Dr. Bleicher has dedicated his career to drawing insights from clinical information and driving practical innovation that helps care providers and the patients they serve. He joined the Optum organization in 2013 with leading clinical informatics company Humedica, where he served as chief medical officer for four years. He built and managed Humedica’s analytic operations, was responsible for clinical strategy and oversight and led the company’s product management and regulatory affairs teams. His leadership was instrumental to many Humedica innovations, including products that help care providers improve the quality and timeliness of care, to new ways of understanding and predicting disease, to sophisticated approaches to analyzing clinical data.

Prior to joining Humedica’s founding team, Dr. Bleicher was a founder of and spent 11 years building and guiding the growth of Phase Forward, which led the transformation of pharmaceutical clinical trials from paper to the web. Dr. Bleicher also led clinical strategy and operations for Alpha-Beta Technology, worked as a medical monitor at PAREXEL and served on the faculty of Harvard Medical School.

Dr. Bleicher earned his MD and PhD degrees from the University of Rochester School of Medicine and Dentistry and holds a BS degree from Rensselaer Polytechnic Institute. He trained in internal medicine at the Beth Israel Hospital and dermatology at the Massachusetts General Hospital.

Dr. Bleicher has been active in the leadership of various community, professional, and educational institutions in the past, and currently serves on the National Council of the University of Rochester School of Medicine and Dentistry as well as the healthcare informatics advisory committee at Brandeis University. He is also currently a member of the IOM Roundtable on Value & Science Driven Health Care. 

Karen Erickson

Executive Vice President, Chief Quality Officer

Karen Erickson became executive vice president and chief quality officer of Optum in 2012. In this role, she focuses on enabling and ensuring high-quality execution and performance on behalf of Optum’s many clients, partners and stakeholders across the health care system. She is also responsible for overall corporate readiness, as well as compliance and privacy assurance.

In 2011, Erickson was the chief administrative officer of Optum, responsible for oversight of human capital, communications, marketing and real estate. For the previous four years, she served as senior vice president and corporate controller for UnitedHealth Group. She has been with the company for more than 12 years in various senior Finance roles, including CFO of Alliances, as well as senior vice president of Finance, chief financial officer of Operations, chief financial officer of Small Business and controller for UnitedHealthcare. Prior to joining UnitedHealth Group, Erickson was an auditor with KPMG, LLC for 10 years in Virginia and Minnesota. Erickson graduated summa cum laude from Old Dominion University in Norfolk, Va., in 1989, and was a certified public accountant in both Virginia and Minnesota (currently inactive).

Jack Larsen

Executive Vice President, Collaborative Care

Jack Larsen is the executive vice president for Optum’s Collaborative Care efforts. The Collaborative Care business focuses on care delivery through a variety of programs, including advanced clinical services for the most complex and frail populations, market leading behavioral health and other specialty networks, urgent care centers and high performing physician networks. Under Larsen’s leadership, the Collaborative Care business is deepening integration across these areas and other parts of the health care system to make it work better.

Prior to his current role at Optum, Larsen served as chief executive officer of UnitedHealthcare Medicare & Retirement. As chief executive officer of the nation’s largest business dedicated to the health and well-being of seniors, Larsen led efforts to create innovative care solutions that helped beneficiaries live healthier lives, including rapidly expanding the HouseCalls member home visit program to perform more than 670,000 visits in 2013.

Prior to leading UnitedHealthcare Medicare & Retirement, Larsen served as chief executive officer of UnitedHealthcare Community & State where he created greater access to quality care and produced cost-effective Medicaid solutions for states facing intense budget pressures. In addition, he established meaningful partnerships with world-class organizations, such as Sesame Street, to advance the health of America’s children.

Larsen has held a number of additional leadership roles in UnitedHealth Group, including chief financial officer for Medicare & Retirement and the Public & Senior Markets Group, and president of UnitedHealthcare’s Evercare business. He joined UnitedHealth Group in 2005 as vice president of Corporate Development, where he was responsible for all merger and acquisition activity for the company.  

Before joining UnitedHealth Group, Larsen served as senior vice president of operations at Jostens, Inc.  He is a member of the American Institute of Certified Public Accountants and the Minnesota Society of Certified Public Accountants.

Steve Larsen

Executive Vice President, Government Solutions

Steve Larsen is the executive vice president of Government Solutions at Optum. He joined Optum in July of 2012.

Larsen previously served as Deputy Administrator and Director of the Center for Consumer Information and Insurance Oversight (CCIIO), Centers for Medicare & Medicaid Services, U.S. Department of Health and Human Services.

Prior to joining HHS, Larsen served in a number of capacities at Amerigroup Corporation, a public managed care company serving the Medicaid and Medicare populations. His roles included CEO of Amerigroup Maryland, Executive Vice President of Health Plan Operations, and Senior Vice President for External Affairs and Business Development. Larsen also served six years as Maryland Insurance Commissioner, Chief Legislative Officer for Governor Parris Glendening, Chairman of the Maryland Public Service Commission for Governor Martin O’Malley, and was a Member of the Maryland Health Services Cost Review Commission.

Larsen holds a B.A. degree from Gettysburg College, an M.A. degree in Public Policy from the Eagleton Institute of Politics at Rutgers University and a J.D. degree from Rutgers University.

Mike Matteo

Chief Growth Officer

Mike Matteo is chief growth officer at Optum, where he is responsible for creating and enabling growth across the company. Matteo focuses on the needs and opportunities of Optum’s customers and how the company can deliver creative, innovative solutions that meet their objectives. Prior to bringing his passion for modernizing the health care system to Optum in 2012, Matteo served for four years as chief executive officer of UnitedHealthcare National Accounts, where he expanded the company’s industry-leading position in the large-employer marketplace. Prior to becoming CEO, Matteo led business development efforts for UnitedHealthcare National Accounts, where previously he worked in product development and was instrumental in designing and launching the company’s first consumer-driven product innovations. He joined UnitedHealth Group in 1997 as a strategic account executive, helping many of the company’s largest employer clients meet their health care objectives.

Before joining UnitedHealth Group, Matteo was with Physicians Health Services, where he served the needs of major clients as an underwriting director and senior account executive. He began his career serving in multiple roles with Traveler’s Insurance Companies. Matteo graduated magna cum laude with honors from the College of the Holy Cross, and participated in the Columbia University Executive Management Program. He is on the boards of the MetroHartford Alliance, Hartford YMCA, and Connecticut Science Center, and served as chairperson of the Greater Hartford Arts Council Capital Campaign.

Bill Miller

Chief Executive Officer, OptumInsight

Bill Miller is chief executive officer of OptumInsight. He joined the company in 2008 and has served as president of provider solutions until his appointment as CEO in 2012. Under his direction, the provider business at OptumInsight grew to become a leader in providing services and solutions to the delivery system.

Prior to joining OptumInsight, Bill was vice president of technologies at Cerner Corporation in Kansas City, Mo., for more than six years. There, he had global responsibility over all Cerner’s technology businesses as well as its managed services, outsourcing and Advanced Technology Consulting Practices. Bill also has a significant background as an entrepreneur, serving as CEO of three technology companies he founded or co-founded in the 1990s. He still is an active board member for one of these companies, and serves on other boards of privately held technology companies. Bill earned a Master of Science in urban planning and a Bachelor of Science in economics from the University of Kansas.

Eric Murphy

President, Payer Market Solutions, Optum

Eric Murphy is the president of payer solutions for Optum, helping clients achieve their growth, operating cost, compliance, risk and clinical transformation goals. He is a seasoned leader with more than 30 years of experience in the outsourcing, systems integration and consulting services industries. Eric has led large technology and service organizations and served as a senior consulting leader.

Prior to joining Optum, Eric served as president of business development, global outsourcing services, for Computer Sciences Corporation, where he was responsible for a team with an annual new business revenue target of $7 billion across multiple industries, including health care. Before that, he was co-founder and executive vice president of Agilera, Inc., a management consulting partner at Ernst & Young LLP, and a vice president of the Financial Services Insurance business unit at EDS Corporation. Eric holds a Bachelor of Science from the Brown School of Petroleum Engineering, Marietta College, in Marietta, Ohio.

Jim Murphy

Executive Vice President, Optum

Jim Murphy joined Optum in 2012 as executive vice president. He presently supports the design, development, and delivery of health insurance exchange platforms for federal and state exchanges.  Previously, Murphy led Optum’s private exchange program to deliver platform-enabling, consumer-centric health care services education, shopping and management solutions for employers, brokers, and health plans. He also managed Optum Financial Services and Optum Bank, an industry-leading consumer health account and health care payment business. Murphy joined Optum after two years as chief operating officer for UnitedHealthcare’s Medicare business.

Murphy has spent the last three decades building, operating and leading organizations whose success is dependent on operational and technical excellence. Murphy was president of Fidelity Human Resources Services. He also held executive positions at J.P. Morgan Retirement and State Street Bank. Murphy earned a Bachelor of Science in Information Systems and a Master of Business Administration in Finance at Northeastern University.

Lynn Myhran

Senior Vice President, Human Capital

Lynn Myhran is senior vice president of human capital at Optum. She joined UnitedHealth Group in August 2002 as director of human capital development in the UnitedHealth Group Learning and Development function, where she was responsible for the design, development and delivery of a variety of human capital core processes and organizational effectiveness initiatives.

In 2004, Myhran became the senior human capital partner for Corporate and United Health Technologies (UHT). In 2007, she became the senior vice president for the Corporate Market Group with responsibility for UnitedHealth Group Information Technology (UHG IT), Corporate and United Health International where she led human capital for the business. Myhran’s more than 20 years of professional experience includes leadership positions at Arthur Andersen and ITT Consumer Financial Corporation in human resources, operations and finance. She previously served as a board member of the Jacob Wetterling Foundation in Saint Paul, Minn.

David Orbuch

Executive Vice President

David Orbuch joined Optum in 2013 as executive vice president to help lead the company’s ongoing focus on building optimal collaboration and service experiences for its clients.

Orbuch is a proven strategist with more than 15 years of experience helping health care organizations meet the needs of the people and communities they serve. Prior to joining Optum, David served for four years as government programs chief compliance officer for UnitedHealthcare. Before that, he was president of the Minneapolis-based Phillips Eye Institute and the Phillips Eye Institute Foundation. Orbuch also served as executive vice president of corporate responsibility and chief compliance officer at Allina Hospitals and Clinics. Prior to focusing his career on the health care industry, he was a federal and state prosecutor for more than 10 years.

Orbuch is an adjunct professor at Hamline University School of Law in St. Paul, Minnesota, a Board Member of the Hennepin Health Foundation, the Minneapolis Jewish Federation, a Board Committee Member of Allina Health, and actively volunteers for a number of civic, philanthropic and religious community organizations.

Orbuch earned his bachelor’s degree with honors in Psychology and Philosophy from the University of Wisconsin, and his law degree with honors from the University of Minnesota in Minneapolis.

John Prince

Executive Vice President, Chief of Operations

John Prince serves as executive vice president and chief of operations of Optum. He is responsible for creating and leading the shared services organization, overseeing cost management and the company’s operational execution and quality. John has been with UnitedHealth Group since late 2005 and served as the executive vice president and chief financial officer of Optum, the first chief operating officer of OptumHealth and led the formation of OptumHealth Financial Services as its chief executive officer.

Prior to joining UnitedHealth Group, John served as senior vice president and head of health care business development and strategy at JPMorgan Chase and was a partner at Arthur Andersen in the health care strategy and operations consultancy practice. He holds an undergraduate degree in economics and mathematics from Northwestern University, as well as a Master of Business Administration from Northwestern's Kellogg School of Management. John is on the board of the Minneapolis Institute of Arts.

Tami Reller

Executive Vice President, Chief Marketing Officer

Tami Reller joined Optum in 2014 to lead brand strategy and marketing initiatives focused on growing awareness and appreciation of the company’s innovation-driven value proposition in the health care marketplace.

Reller came to Optum following an accomplished, 13-year career at Microsoft, where she most recently served as executive vice president of marketing. She held a succession of key leadership roles during her time at Microsoft, including five years as a corporate vice president for the Windows division. During that time, she held dual roles of chief financial officer and chief marketing officer for Windows, and subsequently served as divisional co-leader responsible for the Windows and Surface product businesses. 

Prior to Microsoft, Reller served for 16 years at Great Plains Software, rising through the organization to become the company’s chief financial officer prior to its 2001 acquisition by Microsoft. She has also devoted time and expertise to the Seattle Children’s Hospital Foundation as a board member.

John Rex

Executive Vice President, Chief Financial Officer

John Rex joined Optum in 2012 as executive vice president and chief financial officer. He brings deep health care industry experience and insight to his role with Optum.

Prior to joining Optum, he served JP Morgan as one of the top equity research analysts in the country, covering both the managed care and health care facilities sectors. He was the first to achieve dual ranking in both of these sector categories in the Institutional Investor poll, and was voted the top analyst in managed care for eight consecutive years. Prior to his work as an equity analyst, Rex worked in and for the health care services industry, as a strategy and operations consultant focused exclusively on health services. His specializations as a consultant spanned providers, health systems, managed care, integrated delivery networks and clinical research organizations. Before moving into the consulting field, Rex managed audit engagements for a Big 4 accounting firm, also with a specialization in the health services industry. Rex holds an MBA, with a concentration in finance, from The Wharton School of the University of Pennsylvania and a dual Bachelor’s degree in accounting and economics from Brigham Young University. He is also a Certified Public Accountant (currently inactive).

John Santelli

Chief Information Officer

John Santelli is chief information officer at Optum, where he leads the advancement of commercial Information Technology Outsourcing (ITO), business processing, software and cloud services. He also leads Optum technology strategy, planning, coordination and integration with the UnitedHealth Group technology agenda, with a focus on providing innovative solutions across the enterprise. Santelli has played a pivotal role in technology growth and development at UnitedHealth Group. He held the position of chief information officer for Uniprise Technologies from 2004-2006, and chief technology officer for UnitedHealth Group in UnitedHealth Technologies from 2002-2004. He led enterprise architecture and strategic system planning for UnitedHealth Group, established enterprise technology direction with UnitedHealth Group businesses and developed much of the corporate technology architecture.

Santelli joined UnitedHealth Group in 1986 and has extensive experience in software engineering and application development. He has a strong background in the development of high-volume transaction processing systems and medical claim-related systems. He holds a Master’s degree in software engineering from Union College, Schenectady, N.Y. He received his undergraduate degree in computer science from State University of New York, Brockport.

Lisa Tseng, MD

Executive Vice President

Dr. Lisa Tseng leads Optum Complex Population Management, Optum Clinic and hi HealthInnovations. Optum Complex Population Management delivers patient-centric care to medically complex individuals, improving health outcomes while reducing cost. Optum clinicians visit and treat patients where they live, focusing on proactive management to avoid unnecessary hospitalizations and emergency room visits. Optum Clinic provides on-demand access to high quality care at low prices, including urgent care, same-day labs and imaging, and wellness programs. hi HealthInnovations is making hearing health care more affordable and accessible for 48 million Americans with hearing loss.
Prior to this role, Dr. Tseng served as Chief of Staff for UnitedHealthcare’s public programs including Medicare and Medicaid. She also served as Vice President of Strategy and Business Development at Fidelity Investments, Vice President of Corporate Integration Strategy for AARP Services and management consultant at Oliver Wyman. Dr. Tseng holds a Bachelor of Science degree in Physiological Science and minor in Neuroscience from UCLA and Medical Degree from the UCLA School of Medicine. She served on the National Leadership Team of the American Medical Student Association and was the National President of the Asian Pacific American Medical Student Association. Dr. Tseng has also served on the board of several community health clinics.

Michael Weissel

Executive Vice President

Mike Weissel joined Optum in 2013 as executive vice president and leads the Consumer Solutions Group.  The Consumer Solutions Group provides solutions to help sponsors improve population health and consumers to take better control of their health care needs.  

Prior to joining Optum, Weissel was with leading international management consulting firm Oliver Wyman for 17 years. He founded Oliver Wyman’s Health & Life Sciences practice in 2007, and served as managing partner and global leader for that practice until 2013. He also held a variety of roles for Marsh & McLennan, Oliver Wyman’s parent company, related to leading cross-company collaboration focused on the health care space. Weissel has provided strategic leadership on a wide range of issues for health care system participants, with a specific emphasis on payers, health services and enablement companies. He has deep industry experience in health care reform, exchange and distribution strategies, value-based healthcare, customer and account management activities and organizational transformation. Prior to Oliver Wyman, Weissel was a Certified Public Accountant and associate partner at Price Waterhouse.

Weissel has been widely published on a variety of health care-related topics in leading journals, including Harvard Business Review. He holds an MBA from Duke University and a BA from the University of Massachusetts.

Brian Wenger

Executive Vice President, Chief Legal Officer

Brian Wenger joined Optum in 2014 as executive vice president, chief legal officer. He oversees all legal matters for the company, plays a central role in developing and guiding Optum strategic growth initiatives and participates in key enterprise initiatives across UnitedHealth Group.

Prior to joining Optum, Wenger served since 2011 as chair of the prominent Midwest-based law firm Briggs and Morgan, where he practiced for more than 25 years. Wenger provided leadership in several areas for Briggs and Morgan during his career at the firm, notably as chair of the firm’s commercial practice and chair of the business law section. Wenger supported regional and national clients in civil law matters ranging from complex business and commercial transactions, joint ventures and mergers.

Wenger applies a unique, interdisciplinary approach to his work through his expertise in health care, finance, intellectual property, contracts, taxation, employee relations, governance and corporate strategy. He earned his BA from Marquette University and his law degree from Villanova University, where he was a member of the Villanova Law Review.

Wenger serves as vice chair of the University of St. Thomas School of Law, and serves on the University of Minnesota Foundation’s Board of Trustees.

Tim Wicks

Chief Executive Officer, OptumRx

Tim Wicks was named chief executive officer for OptumRx in 2014. In this role, he oversees all Optum pharmacy benefit management (PBM) programs, including pharmacy network, mail service and specialty pharmacy. Wicks has held a broad range of executive management positions with UnitedHealth Group, including operations, product management and business development roles at UnitedHealthcare and Optum. Prior to his current position, he served as senior vice president, Industry & Network Relations for OptumRx.

Previously, Wicks was chief financial officer and then became president and chief operating officer of a Fortune 500, publicly traded heavy freight transportation and logistics service provider. He also held executive positions at Dell, Inc., Northwest Airlines and Bain & Company. In addition, Tim co-founded a registered investment advisory firm that developed quantitative investment strategies for institutional clients.

Wicks holds a Bachelor of Arts degree in economics from the University of Chicago and a Master of Business Administration degree from Harvard University’s Graduate School of Business.