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VA Eastern Colorado Health Care System


Leadership Team

Portrait of Sallie Houser-Hanfelder

Sallie Houser-Hanfelder | 303-393-2800


Portrait of Natalie Merckens

Natalie Merckens | 303-393-5179

Associate Director

Portrait of Richard Tremaine

Richard Tremaine | 720-857-5070

Associate Director for Activations

Portrait of Ellen Mangione MD, MPH

Ellen Mangione MD, MPH | 303-393-2820

Chief of Staff

Portrait of Harold Dillon

Harold Dillon | 303-399-8020 x2881

Deputy Chief of Staff

Portrait of Keith Harmon RN, BSN, MBA

Keith Harmon RN, BSN, MBA | 303-398-7469

Interim Associate Director, Patient Care Services

Portrait of Joshua Pridgen

Joshua Pridgen | 303-393-2836

Assistant Director

Portrait of Nathan Nidiffer

Nathan Nidiffer | 719-327-5660

Regional Manager, Southern Colorado Clinics