About IES

Leadership Team

Nick Zenarosa
Nick Zenarosa, MD, FACEP
Founder and Chief Medical Officer
Bob Timmermann
Bob Timmermann
President and Chief Executive Officer
Gregg Kirkland
Gregg Kirkland
Chief Financial Officer
Victoria Feather
Victoria Feather
Chief Integration Officer
Clare Elizabeth Graca
Clare Elizabeth Graca
Chief Operating Officer
Matt Innes
Matt C. Innes
In-house Counsel
Christopher Welch
Chief Financial Officer
Steve Arze
Steve Arze, MD, FACEP
Executive Vice President
Liz Fagan
Elizabeth Fagan, MD, FACEP
Director of Education
John Garrett
John S. Garrett, MD, FACEP
Vice Chief Quality Officer
Dahlia Hassani, MD, FACEP
Executive Vice President
Ron Jensen
Ronald J. Jensen, DO, MSHM
Executive Vice President
Judy Keller
Judith A. Keller, RN, DNP, CEN
Chief Nursing Officer
Kevin Marcum
Kevin S. Marcum, PA-C, MPAS
System Director of Advanced Practice Providers and Operations
Bob Risch
Robert M. Risch, MD, MBA, FACEP
Chief Quality Officer
Jose Robert Rosillo, MD
Jose Robert Rosillo, MD
Regional Quality Officer, Central Texas
Chet Schrader, MD, FACEP
Chet Schrader, MD, FACEP
Executive Vice President