Leadership
Mark Johnson
Interim Chief Executive Officer
As interim CEO, Mark Johnson’s leadership and expertise ensure UNOS meets its mission to save and transform as many lives as possible through research, innovation and collaboration. Read more about Mark Johnson.
Paige Adrians
Director, Communications
Roger Brown
Director, OPTN Operations
Liz Robbins Callahan, Esq.
Associate General Counsel
Laura Cartwright, Ph.D.
Director, Research
Tammy Farmer
Director, Enterprise Project Management Office
Michael Ghaffari
Senior Director, Engineering
Ann-Marie Leary, MBA
Director, Major Initiatives
Lauren Mauk
Director, Contract Operations
