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