Sierra Rheumatology
Meet the team

Three clinicians dedicated entirely to rheumatic disease.

Decades of clinical and research experience across leading institutions — focused on a single, complex specialty so we can give you the time and rigor it deserves.

RD
Sierra Rheumatology
Dr. Robinder Dhillon, MD
Board-certified in Internal Medicine & Rheumatology
Young Investigator Award · ASBMR (2012)
Trained at NIH, Johns Hopkins, Mayo Clinic, Oxford
Peer-reviewed publications & book chapters
Two decades clinical & research experience
Physician · Practice Owner

Dr. Robinder Dhillon, M.D.

Dr. Robinder Dhillon, MD has been part of Sierra Rheumatology's team since 2018. She is board-certified in both Internal Medicine and Rheumatology, and has dedicated more than two decades to clinical care and research across five countries and over twenty hospitals.

She graduated from medical school in 2004, completed her residency at Wayne State University, and pursued her Rheumatology Fellowship at the National Institutes of Health (NIH) in Bethesda, Maryland — where she focused on clinical outcomes research for rheumatoid arthritis and lupus.

Her training and research stints span the NIH, Johns Hopkins, Mayo Clinic, the University of Rochester, Oxford-Radcliffe Hospital (UK), and Christian Medical College (India). In 2012 she received the Young Investigator Award from the American Society of Bone and Mineral Research, and she is first author on original research in the Journal of Bone and Mineral Research, with multiple review articles, book chapters and peer-reviewed publications.

Education
MD, 2004
Residency
Wayne State University · Internal Medicine
Fellowship
Rheumatology · National Institutes of Health
Board Certified
Internal Medicine · Rheumatology
RC
Sierra Rheumatology
Rosemarie Co, NP
Double-certified · ANCC and AANP
20 years critical-care nursing
Family practice scope
Patient education & advocacy
Bilingual care coordination
Family Nurse Practitioner

Rosemarie Co, NP

Rosemarie Co is a Family Nurse Practitioner who brings 20 years of critical-care nursing experience to her role at Sierra Rheumatology. She is licensed as a Family Practitioner and double-certified through both the American Nurses Credentialing Center (ANCC) and the American Association of Nurse Practitioners (AANP).

She earned her Bachelor of Science in Nursing from Toronto Metropolitan University in Ontario, Canada, and went on to complete her Master of Science in Nursing at Samuel Merritt University.

Rosemarie's clinical approach is built on quality care delivery, patient education, and transparent communication — making sure patients and families always understand what's happening, what to expect, and what comes next.

BSN
Toronto Metropolitan University, Canada
MSN
Samuel Merritt University
Licensed
Family Practitioner
Certifications
ANCC · AANP
Manpreet Sandhu, NP
Sierra Rheumatology
Manpreet Sandhu, NP
MSN · Samuel Merritt · UC Davis APP Fellowship
12 years case management · Sutter Care at Home
UC Davis APP Fellowship
Clinical instructor background
Chronic-illness & home-care expertise
Family Nurse Practitioner

Manpreet Sandhu, NP

Manpreet Sandhu is a Family Nurse Practitioner whose path into advanced practice was shaped by years at the bedside. She earned her Bachelor of Science in Nursing in India, where she also worked as a Registered Nurse and clinical instructor — educating the next generation of nurses.

After moving to the United States, she spent 12 years as a Case Manager with Sutter Care at Home, supporting patients through complex chronic illness. That close, in-home work is what inspired her to pursue her career as a nurse practitioner.

She holds a Master of Science in Nursing from Samuel Merritt University in Oakland, California, and completed an Advanced Practice Provider Fellowship at the Betty Irene Moore School of Nursing, UC Davis Health — preparing her to manage rheumatic and autoimmune conditions across the full continuum of care.

BSN
India
MSN
Samuel Merritt University, Oakland, CA
Fellowship
APP · Betty Irene Moore School of Nursing, UC Davis Health
Licensed
Family Nurse Practitioner
Ready to get the time and answers your case deserves?