Texas Medical Center

TMC Leadership

2013 - RobbinsRobert C. Robbins, M.D.

President & CEO, Texas Medical Center

Dr. Robert Robbins is president and chief executive officer of Texas Medical Center (TMC), the largest medical complex in the world. Dr. Robbins is an internationally recognized cardiac surgeon who has focused his clinical efforts on acquired cardiac diseases with a special expertise in the surgical treatment of congestive heart failure. His research work includes the investigation of stem cells for cardiac regeneration, cardiac transplant allograft vasculopathy, bioengineered blood vessels, and automated vascular anastomotic devices.

A prolific writer, Dr. Robbins has served as guest editor of the Circulation Surgical Supplement and published more than 292 peer-reviewed articles during his career. Prior to TMC, he was professor and chairman of the Department of Cardiothoracic Surgery at Stanford University School of Medicine, director of the Stanford Cardiovascular Institute, president of the International Society of Heart and Lung Transplantation, president of the Bay Area Society of Thoracic Surgeons, chair of the American Heart Association Cardiovascular Surgery and Anesthesia Council, and more. Robbins currently sits on the advisory board of the Ronald McDonald House in Houston and the board of directors for TMC, the Greater Houston Partnership, the Greater Houston Convention and Visitors Bureau, Houston Academy of Medicine, TMC Library, Houston Technology Center, and the Friends of Houston Academy of Medicine.

He earned his bachelor’s degree in chemistry from Millsaps College in 1979 and a medical degree from the University of Mississippi in 1983. He completed his general surgical training at the University of Mississippi in 1989 and his cardiothoracic training at Stanford University in 1992. Dr. Robbins completed post-doctoral research at Columbia University and the National Institutes of Health, and congenital heart surgical fellowships at Emory University and Royal Children’s Hospital.

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McKeonWilliam McKeon

EVP, CSO, & COO, Texas Medical Center

William McKeon is the executive vice president, chief strategy officer, and chief operating officer of Texas Medical Center. He is responsible for driving strategic, operational and programmatic initiatives across the Texas Medical Center’s member institutions to enhance its leadership position in the life sciences.

McKeon has served as an executive for some of the leading companies and institutions in the world, including: Du Pont, Stanford University Medical Center, Raytel, US Oncology, Medtronic, MicroPort (Shanghai) and Cellnovo.

He has served as the chief executive officer for industry-changing companies in Shanghai, China, and London, UK and raised over $67 million in equity financing. McKeon was twice awarded the Computer World – Smithsonian Award in Medicine for innovations in cardiovascular monitoring and the automation of matching cancer patients to clinical trials.

He holds a Bachelor of Science in legal studies from Roger Williams University and earned a Master’s Degree from the University of San Francisco – School of Management.

Castillo-RhodesDenise Castillo-Rhodes

EVP & CFO, Texas Medical Center

Denise Castillo-Rhodes is executive vice president and chief financial officer of Texas Medical Center, where she oversees accounting, finance, billing and collections, and tax compliance.

Outside of her work at Texas Medical Center, Castillo-Rhodes serves on several advisory boards, including Post Oak Montessori School, The Audit and Finance Committee of Medical Bridges, Houston Livestock Show and Rodeo Ticket Services, Greater Houston Partnership’s Executive Women’s Partnership, and Greater Houston Women’s Chamber of Commerce.

Castillo-Rhodes holds a Bachelor of Business Administration from the University of Texas at El Paso and a Master of Business Administration from the University of St. Thomas. She is a certified public accountant and is a member of the Texas Society of Certified Public Accountants and American Institute of Certified Public Accountants.

Cloonan_Shawn_300dpiShawn W. Cloonan

SVP, General Counsel, Texas Medical Center

Shawn W. Cloonan serves as Senior Vice President, General Counsel at Texas Medical Center.  Cloonan is responsible for all legal aspects of the corporation including compliance with the TMC covenants, contracts, real estate, non-profit corporate and tax regulation, intellectual property, employment, employee benefits, and litigation.  Additionally, Cloonan oversees Texas Medical Center’s business operations for leasing, parking and hospitality.

Prior to joining the organization, Cloonan was an attorney with Vinson & Elkins L.L.P. and Bracewell & Giuliani LLP. He holds a Bachelor of Arts – Magna Cum Laude in government from the University of Texas at Austin and earned a Doctor of Jurisprudence with Honors from The University of Texas School of Law. He is on the board of directors of the Housing Corporation of Greater Houston, a member of the Community Investment Committee of the United Way of Greater Houston, and an associate member of the First Tee of Greater Houston and Houston Junior Golf Association.  In 2013, Cloonan was honored to receive the Houston Business Journal’s 40 Under 40 Award.

StokesLarry Stokes

SVP, Shared Services, Texas Medical Center

Larry Stokes is senior vice president of Shared Services at the Texas Medical Center Corporation. In this position he is responsible for oversight and leadership of the following areas; Human Resources, Facilities Maintenance and Management, Information Technology, Campus Security and Safety.

Prior to joining the Texas Medical Center Corporation, Mr. Stokes worked as vice president of Human Resources for the Houston Astros, corporate director of Employee and Labor Relations at Warner Bros Studios and senior employee relations representative for Riverside County, where he represented the county in arbitrations, mediations, and labor matters.

He holds a Bachelor of Science in organizational management from Northrup University and attended Glendale University College of Law in Glendale, CA. He also earned the Senior Professional in Human Resources certification from the Society for Human Resources Management in 2004.

Board of Directors

2K7-0961-075 Holcombe Crosswell portraitMr. O. Holcombe Crosswell


Mr. O. Holcombe Crosswell is Chairman of the Board of Directors of Texas Medical Center (TMC).  Prior to being the chairman, Mr. Crosswell was the Vice Chairman of the Board of Directors, a Member of the Executive Committee, and Chairman of Forward Planning and Covenant Compliance Committees. An alumni of the Kinkaid School, Mr. Crosswell attended the University of Texas and graduated with a BBA in 1963. During his time at the University of Texas, he was a member of the Sigma Alpha Epsilon fraternity. Mr. Crosswell is currently the President of the Griggs Corporation and has in this position since 1970.

His community activities include: The Kinkaid School – Life Trustee and Former Chairman and Co-Chairman of The 100th Anniversary Celebration, Harris County Metropolitan Transit Authority – Former Member of Board of Directors and Chairman, CenterPoint Energy, Inc. – Former Member of the Board of Directors since 1987, University of Houston – Downtown – Advisory Board Member of the Criminal Justice Training Center, The “C” Club – Member and Former President. Also, Mr. Crosswell was awarded in 2011 as one of Houston’s Men of Distinction.

 In addition to all of his accomplishments, Mr. Crosswell is a loving father and husband to his four children, twelve grandchildren, and his wife of over 50 years.


Mr. J. Downey Bridgwater

Vice Chairman

Mr. J. Downey Bridgwater is the Vice Chairman of the Board of Directors of the Texas Medical Center (TMC). In addition to serving on the Board, Mr.Bridgwater is President of Comerica Bank’s Houston Market. He has been a banker in the Houston area since 1977 and served as the Chairman, President and CEO of Sterling Bancshares, Inc. and Sterling Bank through July 2011 when Sterling was acquired by Comerica. Mr. Bridgwater graduated from the University of Houston.

A Senior Fellow of the American Leadership Forum, Mr. Bridgwater also serves on the Finance Council and the Development Board for the Archdiocese of Galveston-Houston as well as the boards of the Greater Houston Partnership, University of Houston Board of Visitors, the Bauer College of Business Dean’s Executive Board at the University of Houston, and the Harris County Housing Finance Corporation. He has served on the boards of many other charitable and community organizations and has received numerous awards and recognitions including the Joseph Jaworski Leadership Award, the University of Houston Alumni Association’s Distinguished Service Award, the Silver Beaver and Whitney M. Young, Jr. Service Award from the Boy Scouts of America.

He and his wife have one son and are members of St. Anne’s Catholic Church.

Board Members

Mr. Andrew M. Alexander

Mr. A.T. Blackshear, Jr.

Mr. John F. Bookout, Jr.

Mr. J. Downey Bridgwater

Mr. Alan R. Buckwalter, III

Mr. Anthony R. Chase

Mr. Holcombe O. Crosswell

Mr. Robert J. Cruikshank

Ms. Lynn Elsenhans

Mr. Elvin Franklin, Jr.

Mr. Gibson Gayle, Jr.

Mrs. Elizabeth Ghrist

Mr. Robert Greer

Mr. James Hackett

Mr. Charles W. Hall

Mr. Bradley N. Howell

Dr. Mae C. Jemison

Mr. Bruce R. LaBoon

Mrs. Robert C. Lanier

Ms. Janiece Longoria

Mr. William N. Mathis

Mr. Patrick C. Oxford

Mr. George A. Peterkin, Jr.

Dr. Robert C. Robbins

Mr. Robert L. Stillwell

Dr. Elizabeth Torres

Mr. Wallace S. Wilson


Ex-Officio Members

President George H.W. Bush

Mr. Gibson Gayle Jr.

Mr. Robert G. Greer

Mrs. Vale Asche Russell