Our Staff

Dr. Giles

Dr. Donald E. Giles has been performing surgery since 1980 and currently assists Dr. Kellogg with certain surgical procedures. In addition to surgery, Dr. Giles is currently a board member for Managed Healthcare Northwest and the Medical Director for Adventist Medical Center Vascular Lab.


BA in Chemistry, Mathematics/Computer Science, Southern University, 1971
MD, Loma Linda University, 1975
Dr. Giles received post-graduate training from Kettering Medical Center, Dayton VA Hospital and Dayton Children's Medical Center in Dayton, OH.

Society Memberships

  • Member, Oregon Medical Society
  • Member, American Medical Association
  • Member, Portland Surgical Society
  • Member, Portland Vascular Society

Tami Amusa

Kellogg M.D. Brain & Spine | Our Staff Portland ORTami Amusa graduated Cum Laude from Warner Pacific College with a Bachelor’s Degree in Business Administration and a minor in Human Resource Management. She has been involved in the healthcare field for more than 17 years, and has served in a number of leadership capacities in healthcare’s business arena, starting with a Front Office Supervisor position at Primary Care Providers. From there, she moved to RS Medical, where she worked as a Worker's Compensation Billing Department Lead. She then served as Lead Collector and Financial Counselor at Legacy Health Systems. Just prior to coming to work for Dr. Kellogg she served as a Collector and Physician Credentialing Coordinator at East Portland Surgery Center.

Tami currently serves as the Office Manager for Dr. Jordi X. Kellogg at Kellogg M.D. Brain & Spine in Portland, Oregon. Her mission is to provide the highest possible level of customer service to patients, fellow employees and referral sources. Tami’s numerous tasks include providing financial counseling to patients, supervising the office staff, and overseeing all patients’ health and financial records. She ensures the privacy of all health information, maintains accurate patient files, and assists with quality assurance to guarantee patient satisfaction. Tami’s strong communication and leadership skills keep the practice running optimally.

sonya dailey

Sonya  serves as the Front Office Specialist and Medical Records Clerk at Dr. Jordi X. Kellogg at Kellogg M.D. Brain & Spine in Portland, Oregon. Her many tasks include answering phones, scheduling appointments, filing, scanning and coordinating patient care. Sonya went to school at Apollo Career College and received her certificate in Dental Assisting. She is a wonderful asset to our practice and is very customer service oriented.

Sonya is originally from Coffey, MO  and has been a member of the Portland community since 2002. She enjoys spin class, golfing and watching her sons play sports.


Jackie Sena

Kellogg M.D. Brain & Spine | Our Staff Portland ORJackie graduated from Concorde Career College in 2012, and went on to complete an externship at Concentra Urgent Care Center. She previously worked as a Dental Assistant at Dr. Warf Family Dentistry, and as a Medical Assistant and Front Office Lead for Concentra Urgent Care Center. Jackie’s wide-ranging skills include patient-flow coordinating, customer service, vital signs, patient care and history, and HIV/AIDS training. She is also CPR- and HIPAA-certified.

Jackie currently serves as the Referral Coordinator and MA for Dr. Kellogg. Her many tasks include coordinating Dr. Kellogg’s referrals, arranging and scheduling surgeries, obtaining insurance authorization, and managing medical records. She is very active in her church’s Women’s Ministry, serving on the women’s board, and acting as a ministry event coordinator. Jackie’s communication skills and work ethic strongly contribute to the running of the practice.