Our Providers

Kayvan Haddadan, MD

Dr. Kayvan Haddadan is the President and Medical Director of Advanced Pain Diagnostic & Solutions, located in California. Dr. Haddadan founded the practice in 2012 and has served as its pain management physician for the past eight years. He works to ensure that each member of the group’s multi-disciplinary clinical team is focused on diagnosing and confirming the source of each patient’s pain, and then carefully developing and documenting the most effective treatment plans.

Dr. Kayvan Haddadan earned his Bachelor of Science degree from the College of Alborz in Tehran, Iran, and his Medical Doctor degree at Shahid Beheshti University of Medical Sciences. Afterward, he went on to receive his Educational Commission for Foreign Medical Graduates (ECFMG) Certificate in Philadelphia before undergoing an internship in Medical Surgery at Loyola University Medical Center’s Stritch School of Medicine in Illinois. Once he’d completed his internship Kayvan decided to fulfill his residency at Stritch School of Medicine in Physical Medicine & Rehabilitation.

Following his time in Illinois, Kayvan went on to complete his Fellowship in Pain Medicine at California Pacific Medical Center’s Pacific Pain Treatment Center while also training in Medical Acupuncture for Physicians from the University of California, Los Angeles, David Geffen School of Medicine. To say that Dr. Kayvan Haddadan is driven and hard-working would be an understatement. Throughout his career as a healthcare professional and a researcher, Dr. Haddadan has been published in 29 different research papers and projects. His research includes studies in gastroenterology, pulmonology, infectious disease, pain management, endocrinology, and cardiology.

Besides being a licensed Physician and Surgeon with the Medical Board of California, Kayvan is also certified in Controlled Substance Registration through the DEA, a Qualified Medical Examiner through California’s Department of Industrial Relations Division of Workers Compensation and double board-certified in Pain Medicine and Physical Medicine & Rehabilitation through the American Board of Medicine and the Board of Physical Medicine and Rehabilitation, respectively.

TJ Maroon

TJ Maroon, MD

He received his medical training at UC Davis School of Medicine and continued his residency and post graduate training at the UCD Medical Center in Sacramento, California. He is board certified in Anesthesiology (1999) and Bariatric Medicine (2012) and treats youth, adolescent, and adult patients.

Dr. Maroon has been providing specialized medical services, including pain management and bariatric medical services, in Sutter, Yuba, Sacramento and Placer counties since 2010. Prior to that, he worked as an instructor in Heald College, Roseville, teaching medical assisting students medical terminology, anatomy, physiology, and medical laboratory skills.

Sara Niknam

Sara Niknam, PA

Sara Niknam joined our practice in early 2018 after earning her Master’s degree in Physician Assistant Studies from Touro University in Henderson, Nevada. Originally, she received her Doctor of Medicine degree from Semnan University of Medical Sciences and Health Services.

She worked as a General and Family physician from 2005 until 2009, when she moved to Virginia. There she became a Medical Research Assistant until 2011. Then, in 2017, Sara earned her Through her extensive experience and interpersonal skills, she has come to be an important part of the Advanced Pain Diagnostic & Solutions pain management family.

 
Rolando Santos

Rolando Santos, RN, NP

Rolando earned his Bachelor of Science in Nursing from the University of Santo Tomas, in Manila, Philippines in 2003, and his Master of Science in Nursing, Family Nurse Practitioner from Samuel Merritt University, in Sacramento California in 2016. He was awarded the Service Excellence achievement by DaVita and the Mercy Touch award by Mercy General Hospital (now Dignity Hospital).

Rolando Santos, Jr. is a Family Nurse Practitioner (FNP), certified in the state of California. He started his FNP career in 2016. Before becoming an FNP, he was an Acute Dialysis RN from 2010 to 2014 and has been an RN since 2003. His work has ranged from the Emergency Department, Medical-Surgical Department, Long Term Care facility RN, and Correctional RN.

 

Erik Smith

Erik Smith, PA-C

He graduated with honors from Utah Valley University, and later from Brigham Young University, majoring in Exercise Science. He then received dual Masters Degrees in Physician Assistant Studies, as well as Public Health, at Touro University-California. He possesses several advanced certifications, which includes training in the field of Addiction Medicine.

He has worked in Emergency Medicine, Urgent Care, Family Practice, as a Sub-Investigator in Medical Clinical Trials, specialized in Amniotic Stem Cell Treatments, and has found his calling in Chronic Pain Management. He has trained and mentored many Medical Students, including the time when he was an Associate Professor of Family Medicine at California Northstate University-College of Medicine.

 

Jaqueline Parker

Jaqueline Parker, FNP

Jacqueline or Jackie, graduated from Samuel Merritt University’s Family Nurse Practioner Program with her Masters of Science in Nursing in 2018. She has over 30 years experience as a registered nurse in Medical -Surgical Nursing, Dialysis and has held multiple supervisory and management positions in the health insurance industry.

She started her NP career at Advanced Pain Diagnostics after interning with Dr, Haddadan as a student NP. Because of the experience she gained as a student, she had decided that helping patients that are suffering from chronic pain is one of the most compassionate ways to apply her experience and knowledge. Jackie loves making a difference at Advanced Pain Diagnostics & Solutions and believes her clinic makes an important difference in the lives of many.

Rajwinder Kaur

Rajwinder Kaur, FNP-BC

Rajwinder graduated from California State University, Sacramento, earning her Bachelor Degree in Nursing with honors. She went on to earn her Master of Science in Nursing (MSN) degree with honors from Sonoma State University. She received multiple scholarships during her educational career, including the Art and Elizabeth Candiotti Scholarship, the Signma Theta Tau Scholarship and the Shelly McGriff Endowed Nursing Scholarship.

In addition to formal education, Rajwinder has over 14 years of Nursing experience including working as a nurse for the Adventist Health/Rideout Hospital, Fort Sutter and Sutter Medical Center Sacramento. She’s worked as a Primary Care Provider with the Health and Life Organization. She is multi-lingual with the ability to speak Urdu, hindi, Punjabi in addition to English.