Our Team

Clinical Psychiatric Team

Alejandro Alva, MD, Chief Medical Officer, CEO

Alejandro Alva, MD, is the CEO and Chief Medical Officer of Pacific Neuropsychiatric Specialists (PNS). Dr. Alva is a pioneer in Neurostar TMS treatment, psychotherapy, clinical testing, addiction, and mental health.

Mohammed A. Shreiba, MD

Mohammed A. Shreiba, MD is a Psychiatry Physician at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry, psychotherapy, and mental health.

Norberto Tuason, MD

Norberto Tuasan, MD is a Psychiatry Physician at Pacific Neuropsychiatric Specialists (PNS) specialized in adult psychiatry, child psychiatry, and mental health.

Jeannette Hanna, MD

Jeannette Hanna, MD is a Psychiatry Physician at Pacific Neuropsychiatric Specialists (PNS) specialized in adult psychiatry, child psychiatry, and mental health.

Tshekedi Dennis, MD

Dr. Tshekedi Dennis, MD is a Psychiatry Physician at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry, psychotherapy, and mental health.

Hugo Gomez Rueda, MD

Dr. Hugo Gomez Rueda MD, MSc, PhD, is a Psychiatry Physician, at Pacific Neuropsychiatric Specialists(PNS) specialized in psychiatry, substance abuse, and mental health.

Yvette Elpidio, MSN, FNP-C

Yvette Elpidio, Nurse Practitioner, MSN, FNP-C, is a certified family Nurse Practitioner at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry, mental health, and medical weight loss.

Sheena Patel, PA-C, CAQ-Psych, Supervisor of Provider Services

Sheena Patel, PA-C, is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry and mental health.

Jennifer Sebastian, PA-C

Jennifer Sebastian, PA-C, is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry and mental health.

Alex Mulé, PA-C

Alex Mulé, PA-C, is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry and mental health.

Brandon Stutz, PA-C

Brandon Stutz, PA-C, is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry and mental health.

Sarah Kantelis, PA-C

Sarah Kantelis, PA-C, is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry and mental health.

Jessica Cuevas Rosas, PA-C

Jessica Cuevas Rosas, PA-C, is a nationally board-certified physician assistant at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry, Nuerostar TMS, and mental health.

Erin Ortiz, PA-C

Erin Ortiz, PA-C, is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry and mental health.

Andrew Johnson, PA-C

Andrew Johnson, PA-C, is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists (PNS) specialized in psychiatry and mental health.

Joseph Nojan, PA-C

Joe Nojan, PA-C is a physician assistant who works with adults and adolescents to help them overcome their mental health challenges and take back control of their life.

Jea Yoo, PA-C

Jea (Jae) Yoo, PA-C is a board-certified Physician Assistant at Pacific Neuropsychiatric Specialists who treats patients at the practice’s office at Orange, California.

Nicole Olivas, PA-C

Nicole Olivas is a board certified Physician Assistant who specializes in psychiatry because she believes in the importance of mental health and increasing access to quality care.

Timothy Vong, PA-C

Timothy Vong, PA-C is a certified Physician Assistant at Pacific Neuropsychiatric Specialists. Over the last year, Timothy has garnered the respect of his community and fellow health care providers with his enthusiasm in helping those in need of psychiatric care.

Sung Jin (Steve) Park, PA-C

Sung Jin, or “Steve” Park, PA-C is a physician assistant at Pacific Neuropsychiatric Specialists. Steve is trained to diagnose, manage, and treat patients with various psychiatric conditions.

Mike Santillan, PA-C

Michael “Mike” Santillan, PA-C is a Nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists where he diagnoses, treats and aide’s individuals with their psychiatric disorders.

Tatiana Gheybi, PA-C

Tatiana Gheybi, PA-C is a board-certified Physician Assistant who works for Pacific Neuropsychiatric Specialists and provides care to patients of all ages.

Michael Choi, PA-C

Michael Choi, PA-C, is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric Specialists.

Elisha Kang, PA-C

Elisha Kang is a nationally board-certified Physician Assistant at Pacific Neuropsychiatric
Specialists (PNS).

Rachel Paganelli, PA-C

Rachel Paganelli, PA-C, MSHS, is a certified Physician Assistant at Pacific Neuropsychiatric Specialists (PNS). Rachel believes not all wounds are visible and works with adult psychiatric patients at the practice’s mental health clinic in Orange, California.

Brandy Martinez, PA-C

Brandy Martinez, PA-C, is a board-certified physician assistant who works at Pacific Neuropsychiatric Specialists (PNS) providing psychiatric services in a compassionate and comprehensive manner.

James Tolentino, PA-C

James Tolentino, PA-C is a board-certified Physician Assistant with a passion for providing exceptional patient care.

Marissa Dembek, PA-C

Marissa Dembek, PA-C is a nationally board-certified physician assistant at Pacific Neuropsychiatric Specialists.

Board of Executive Directors

Pepper Alva, President

Patricia “Pepper” Alva is a proven and highly effective Medical Executive with 15 years experience in the pharmaceutical industry and has been in leadership at PNS since 2015. Pepper has a Bachelor’s Degree from the College of New Jersey and an Associate’s Degree from Mercer County Community College.

Executive Team

Rachel Ramirez, Director of Special Projects & Process Improvement

Rachel has broad experience in the management of Rehabilitation Facilities, and Medical Offices. Additionally, has contributed creating and applying new processes that are essential at PNS for the comfort and care of our patients.

Daniela Vasquez, Executive Account Manager

Daniela has been with PNS for several years and has experience in all areas of operations and administration. She has an exceptional work ethic and is a key member of our team.
Daniela works with both Dr. Alejandro Alva and Pepper Alva on Addiction Medicine Management and overall implementation of projects.

Danielle Mann, Director of Human Resources

Danielle Mann has over 10 years of Human Resource and Management experience. She has been a successful part of leadership teams where she strengthened company-employee relationships, coaching and change management, and created multiple learning and development programs for employees. She is excited to be part of the PNS team and to help continuously improve an awesome culture and employee experience.
Danielle holds a Bachelor’s Degree in Social and Criminal Justice and is passionate about helping others. She feels that working at PNS has been very rewarding because everyone here is like family and they all strive to help our patients feel their best!