JoAnn Zell, M.D.

A woman with long, light brown hair and glasses smiles at the camera. She is wearing a sleeveless black top and is photographed against a plain gray background.

Dr. Joann L. Zell (Gillis) is a rheumatologist in Aurora, Colorado and works at the University of Colorado. She received her medical degree from McGaw Medical Center of Northwestern University and has been in practice for more than 20 years.