MedCare Investment Funds, Logo


The Team

Founder - James R. Leininger, MD |  President - Thomas W. 'Tim' Lyles, Jr
CFO - Todd B. Callister, MBA | CIO - John Doulis, MD
Member, Executive Committee - Gerhard Bette


James R. Leininger, MD

Dr. Leininger has been a founder and investor in more than 40 companies. In 1976 he founded Kinetic Concepts (KCI:NYSE) as a specialty hospital bed company and served as CEO and then Chairman for over 20 years (he is now Chairman Emeritus). KCI has grown to be a diversified equipment, device and biologics company focused on preventing and healing wounds of all types; it had 2009 revenues of approximately $2 billion. In 1991, Dr. Leininger formed a private venture investment firm known as MedCare Investment Funds through utilization of his private equity and management firm. He is also a co-founder of Renal Care Group along with Dr. Jacobson and the late Sam Brooks.

Dr. Leininger has founded and established numerous healthcare companies through or with his private equity team. Examples include companies in the healthcare services sector (an ambulatory services company partnering with physicians and providing dialysis and radiation oncology services; an outpatient imaging services and management company), the medical technology sector (a medical device company with two CE Marks-approved devices and one FDA-approved device; a company developing a device to treat glaucoma and presbyopia), the healthcare information technology sector (a physician practice software company focused on women’s health; an early stage healthcare informatics company creating electronic medical records for Regional Health Information Organizations (RHIOs), large healthcare systems, hospitals and multisite practices; a benefits management company utilizing proprietary software), and the pharmaceutical sector (a pre-revenue drug discovery and development company with two promising drugs in phase III clinical trials).

Back to Top


Thomas W. “Tim” Lyles, Jr

Mr. Lyles has managed an investment portfolio for over 20 years, including both public and large private companies. He also serves on numerous for-profit and non-profit Boards of Directors. Mr. Lyles’ primary responsibility is President of a private holding company, which oversees both strategic and operational issues for companies with Dr. Leininger. In 1991, Dr. Leininger formed a private venture investment firm known as MedCare Investment Funds, which Mr. Lyles is a co-founder of, and he has served as President since 2002. As a founding partner, Mr. Lyles was an active member of management in founding Renal Care Group along with Dr. Jacobson and the late Sam Brooks. Mr. Lyles, through his role as President of MedCare Investment Funds, has founded and established numerous healthcare companies. Examples include companies in the healthcare services sector (an ambulatory services company partnering with physicians and providing dialysis and radiation oncology services; an outpatient imaging services and management company), the medical technology sector (a medical device company with two CE Marks-approved devices and one FDA-approved device; a company developing a device to treat glaucoma and presbyopia), the healthcare information technology sector (a physician practice software company focused on women’s health; an early stage healthcare informatics company creating electronic medical records for Regional Health Information Organizations (RHIOs), large healthcare systems, hospitals and multisite practices; a benefits management company utilizing proprietary software), and the pharmaceutical sector (two pre-revenue drug discovery and development companies with one initiating Phase I clinical trial planning and a second with two promising drugs in phase III clinical trials).

Mr. Lyles has also helped found and build multiple high tech businesses primarily involving data transmission over cellular technology. From 1984 to 1989, Mr. Lyles was an attorney with the law firm of Haynes and Boone in Dallas, Texas. During 1986 and 1987, he taught Real Estate Financing at Southern Methodist University in Dallas. From 1983 to 1984, he was appointed a Briefing Attorney for the Chief Justice of the Supreme Court of Texas. In 1983, Mr. Lyles received his J.D., Cum Laude from SMU School of Law. Prior to attending law school, he was employed by KPMG Peat Marwick. Mr. Lyles earned an accounting degree from Texas A & M University, where he graduated Summa Cum Laude in 1979. In addition, Mr. Lyles is a Certified Public Accountant and has written material for the Texas State Bar and has been a speaker for the State Bar of Texas and the Dallas Bar.

Back to Top


Todd Callister

Mr. Callister joined MedCare Investment Funds in 2009 and is integral to the fund management and strategic and operational oversight of the portfolio companies. He is responsible for funding, transactions and investment banking relationshsips. He has over 20 years of operating, consulting and investing experience. Mr. Callister has managed over $700 million of investments in private equity investments, enterprise value exits in excess of $1.5 billion, participated in the start-up or investment in 11 companies, and a portfolio of 18 companies with 8 FDA PMA trials.

Mr. Callister began his career at the United States Senate as a Tax Fellow to Senator Orrin Hatch in Washington, D.C. He spent 11 years with CURA Capital Corporation, a national medical equipment leasing company (fka KCI Financial Services and previously owned by Kinetic Concepts, Inc.). He served as Controller, CFO and President of CURA and was involved in $150 million in public and private debt and commercial transactions. Mr. Callister consulted with Mission City Management, Inc. and MedCare Investment Funds for five years where he performed diligence, negotiated deals and documents and oversaw many of the companies in Dr. Leininger’s portfolio funds. He also provided financial and management consulting services through his own consultancy for four years. Mr. Callister earned an accounting degree from Southern Utah University and received his MBA from Brigham Young University, where he was ranked second in his executive program. He speaks Mandarin Chinese and lived in Taiwan for two years.

Mr. Callister is heavily egaged in community service partnering with Toussaint L'Overture Cemetery, McLemore House, Red Cross, United Way and other community and religious organizations.

Back to Top


John Doulis, MD

Dr. Doulis is former Assistant Vice Chancellor and Chief Operations Officer of the Informatics Center at Vanderbilt University.  In this role, he was the single point of focus for the Informatics Center’s efforts to provide the most effective informatics and information technology infrastructure to meet the needs of the diverse operating units that make up VUMC. The objective of the position was to be best of class in support of medical center operations through informatics and information technology infrastructure.

As Chief Information Officer of MedCare, Dr. Doulis is responsible for the development of the information technology investment strategy for the fund and increase the value of the portfolio companies utilizing 20 years of experience as a physician executive, scientist, and architect and manager of healthcare information systems. Dr. Doulis received his M.D. from Monash University, Melbourne, Australia and has an extensive publication and presentation record.

Back to Top


Gerhard Bette

Gerhard Bette joined the Executive Committee of the Medcare Investment Funds in September of 2014.

Mr. Bette is a Senior Partner Emeritus of McKinsey & Company, Inc., the leading global consulting firm. He retired from McKinsey’s Chicago office at the end of October 2010 after more than 28 years serving leading global institutions on some of their most important issues. His practice focused on working with senior teams of technology-based companies in healthcare, IT and telecommunications industries. He has also worked with several Private Equity firms on due diligence efforts and portfolio company management issues. At McKinsey Mr. Bette held a range of internal governance and leadership roles.

Since his retirement, he has been continued to be active as an advisor and coach to several of his former clients, including some global private equity and alternative investment firms. He serves on several private equity portfolio company boards. For more than a decade Mr. Bette has also been an Adjunct Lecturer at the Department of Management, Organization and Strategy at the Kellogg School of Management at Northwestern University, where he has taught courses on a range of topics including business building, problem solving and managing in professional service firms. He has been active in supporting non- profit organizations in the Chicago area, both as a coach of nonprofit executives, and as a board member.

Mr. Bette holds an MBA from the Harvard Business School, a Doctorate in Mathematics from the University of Duisburg, Germany. He graduated from the University of Dortmund, Germany with a degree in Mathematics and studied at the Universite Pierre et Marie Curie, Paris with postgraduate scholarships from the French and German governments.

Back to Top