About IES

Leadership Team

Nick Zenarosa
Nick Zenarosa, MD, FACEP
Founder and Chief Medical Officer
Jeffery Lawrence
President and Chief Executive Officer
Bob Timmermann
Bob Timmermann
Founder and Board Member
Victoria Feather
Victoria Feather
Chief Integration Officer
Matt Innes
Matt C. Innes
In-house Counsel
Christopher Welch
Christopher Welch
Chief Financial Officer
Steve Arze
Steve Arze, MD, MBA, FACEP
Executive Vice President, BEST, PA
Liz Fagan
Elizabeth Fagan, MD, FACEP
Director of Education, BEST, PA
John Garrett
John S. Garrett, MD, FACEP
Chief Medical Officer, BEST, PA
Ronald J. Jensen, DO, MSHM
Executive Vice President, IES, Houston
Judy Keller
Judith A. Keller, RN, DNP, CEN
Chief Nursing Officer
Bob Risch
Robert M. Risch, MD, MBA, FACEP
Chief Quality Officer
Jose Robert Rosillo, MD
Jose Robert Rosillo, MD, FACEP
Executive Vice President, IES, Houston
Chet Schrader, MD, FACEP
Chet Schrader, MD, FACEP
Executive Vice President, IES, PGPA
Joseph Young, DO, FACEP
Executive Vice President, IES, Houston