Meet our team

Fellowship directors

David Copenhaver, M.D., M.P.H. 
Director
Pain Medicine, Anesthesiology
dcopenhaver@ucdavis.edu

Charles DeMesa, D.O., M.P.H.
Co-Director
Pain Medicine, Physical Medicine
cdemesa@ucdavis.edu

Scott M. Fishman, M.D. 
Executive Director
Pain Medicine, Psychiatry, Palliative Care
smfishman@ucdavis.edu

Sergio Aguilar-Gaxiola, M.D., Ph.D. 
Associate Director
Internal Medicine
aguilargaxiola@ucdavis.edu

Gagan Mahajan, M.D.
Associate Director
Pain Medicine
gmahajan@ucdavis.edu


Fellowship faculty

Timothy Cutler, Pharm.D., BCGP
Outpatient Pharmacy, Anticoagulation Services
timcutler@ucdavis.edu

Shelly Henderson, Ph.D.
Family and Community Medicine
slhenderson@ucdavis.edu

Stephen Henry, M.D., M.Sc.
Internal Medicine, Geriatric Medicine, Bioethics
sghenry@ucdavis.edu

Mark Holtsman, Pharm.D.
Anesthesiology, Pain Medicine, Inpatient Pharmacy, Inpatient Pain Service

Ian Koebner, MSc., MAOM, L.Ac.
Pain Medicine
ikoebner@ucdavis.edu

Samir Sheth, M.D.
Pain Medicine, Anesthesiology
sjsheth@ucdavis.edu

Naileshni Singh, M.D.
Pain Medicine, Anesthesiology
naisingh@ucdavis.edu