Our Team
Administrative Team
The administrative team of the Department of Orthopaedic Surgery is a vital component of the department's success. Located in the Lawrence J. Ellison Ambulatory Care Center, the team is responsible for seamlessly operating the department's programs and services, delivering unparalleled support to the faculty and staff. With diverse backgrounds and extensive experience, the team brings a wealth of skills and expertise to their roles, making them an essential part of the department's success.
Chief Administrative Officer
Joseph MacDonald, M.B.A.
jemacdonald@ucdavis.edu
916-734-8154
Management Service Officer
Rieko Ringo
ruringo@ucdavis.edu
916-734-7103
Finance Analyst
Sharon Misewich, CRA
Research and Finance Analyst
sbmisewich@ucdavis.edu
916-734-4280
Academic Personnel
Shannon Untalasco
Academic Personnel Manager
suntalasco@ucdavis.edu
916-734-3889
Robyn Baker
Academic HR Analyst II
Administrative Staff
Mazie Grigas
Administrative Assistant to Trauma
mjngai@ucdavis.edu
916-734-2182
Rebecca Misner
Administrative Assistant to Foot/Ankle and Sports Medicine Services
rjmisner@ucdavis.edu
916-734-5874
Nicole Nisson
Administrative Assistant to Hand and Pediatrics Services
nsnisson@ucdavis.edu
916-734-3678
Debra Sample
Executive Analyst to the Department Chair
dasample@ucdavis.edu
916-734-7353
Michelle Ramirez
Administrative Assistant to Adult Reconstruction and Pediatrics
manramirez@ucdavis.edu
Madeline Snoke
Front Desk/Research Administrative Assistant
mfsnoke@ucdavis.edu
916-734-3885
Venessa With
Administrative Assistant to Spine Service and Oncology
vwith@ucdavis.edu
916-734-2937
Education Programs
Margaret MacNitt
Education Programs Manager
mlmacnitt@ucdavis.edu
916-734-2807
Delia Luna
Fellowship Coordinator
dbluna@ucdavis.edu
Research Staff
Chancey Sweeney, Ph.D., M.P.A., M.H.A.
Clinical Research Supervisor 2
cassweeney@ucdavis.edu
916-734-6017
Marisa Arnold
Clinical Research Coordinator
mesalvador@ucdavis.edu
916-734-6935
Andrew Buck
Clinical Research Coordinator
ajbuck@ucdavis.edu
Leslie Mellor, CCRC
Sr. Clinical Research Coordinator
ljmellor@ucdavis.edu
Julia Martin, CCRC
Sr. Clinical Research Coordinator
jyhmartin@ucdavis.edu
916-734-8175
Maya Porter, B.S., CCRP
Sr. Clinical Research Coordinator
mtporter@ucdavis.edu
916-734-4216
Oak Park Research Lab
Naymalis La Santa
Lab Manager
nlasanta@ucdavis.edu
Marketing and Communications
Sonia Kumar
Communications Specialist III
sekumar@ucdavis.edu