National Seating & Mobility’s management team, like our company, is geographically diverse, based in cities such as Charlotte, Chattanooga, Indianapolis, Nashville and San Diego.


Photo of William Mixon, CEO

William Mixon

Chief Executive Officer

Photo of Bart Witteveen, CFO

Bart Witteveen

Chief Financial Officer

Photo of John Bertone, Sr. VP of Field Operations

John Bertone

Sr. VP Field Operations

Photo of Ann Mahaffey, VP Human Resources

Ann Mahaffey

VP Human Resources

Photo of Doug McDaniel, VP Business Development

Doug McDaniel

VP Business Development

Photo of Charles Sargeant, VP, Southwest & West Regions

Charles Sargeant

Sr. VP Funding Operations

Photo of Isaac Rodriguez, VP, Northeast Region

Isaac Rodriguez

VP East Region

Photo of Derek Miller, VP, Central Region

Derek Miller

VP Central Region

Photo of Katie Stevens, VP West Region

Katie Stevens

VP West Region

Photo of David Pietrzak, VP Supply Chain & Vendor Management

David Pietrzak

VP Supply Chain
& Vendor Management

Photo of Stephanie Buckley, VP Marketing

Stephanie Buckley

VP Marketing

Photo of Kevin Harmon, VP Financial Operations

Kevin Harmon

VP Financial Operations

Photo of Jeremy Stone, VP Payer Relations

Jeremy Stone

VP Payer Relations

Photo of Mark Marschke, Chief Information Officer

Mark Marschke

Chief Information Officer

Photo of Jeff Matukewicz, In-House Counsel

Jeff Matukewicz

General Counsel
& Secretary

Photo of Ryan Peebles, Director of Government Affairs

Ryan Peebles

Director of
Government Affairs

Photo of Damaris Robles

Damaris Robles

Director of
Operational Excellence

Photo of Karen Shell, Director of Compliance

Karen Shell

Director of Compliance