Our Staff

Clinical Team

Dr. Imani J. Walker

Medical Director

Dr. Imani J. Walker is a physician trained in General Adult Psychiatry. She has had the honor of completing her undergraduate training at the Xavier University of Louisiana as well as earning a Master’s in Science in Public Health from Tulane University. Dr. Walker later obtained her medical degree from New York College of Osteopathic Medicine and completed her training at esteemed medical institutions including Temple University and UCLA.

After completing a fellowship in Forensic Psychiatry, she continued on to open a private practice in Southern California and ultimately went on to caring for acutely ill psychiatric patients including those with substance abuse issues and eating disorders as well as providing mental health care to the homeless and indigent populations.

Dr. Walker also has experience in the emotional impact of racism on people of color, hailing from a mixed race Black Jamaican and Chinese family herself. In addition to Dr. Walker’s medical experience, she also has a witty personality and is able to speak in laymen’s terms in order to relate to her audience. Her personality not only shines through her work but also through her writing.  She has written about mental health and holistic wellness and has been featured as a guest commentator on Gawker, The Grio, The Root and others.

Dr. Walker lives in Los Angeles and is currently a cast member of “Married To Medicine: Los Angeles” debuting on Bravo Network in March 2019.

Janoc Vance

Clinical Director

 Janoc Vance is a proud native of Los Angeles, CA. She has dedicated her life to humanitarian, and philanthropic work as a vessel to strengthen and empower. Coming from a background as a professional in the Performing Arts industry, after intense self-reflection and prayer, Janoc discovered her purpose within an even more in-depth style of the Arts. She realized the Arts was a true gift and passion used to guide her toward her purpose, within the field of, Behavioral Arts and Psychology.

After receiving formal training and graduating with an undergraduate degree in Theatre and Minor in Dance from Prairie View A&M University, and UNLV, 10 years later she re-entered the academic world to further nurture her purpose through graduate studies. She then studied to obtain a  Clinical Doctorate of Psychology with an emphasis as a pschotherapist. She is currently specializing in Psychotherapy treating adults and families dealing with dual diagnoses, trauma, depression, mood and personality disorders. She is also a clinical consultant for film/script writers and character development.

Dr. Vance works with integrative and holistic methods. However, she has taken a liking to differentiation methodologies, aspiring to assist those that are directly or indirectly dealing with addiction to differentiate the symptom vs the cause, the individual vs the system, and the facts vs the emotions.

“I am in love with this work and that which was essentially chosen for me. I believe that addiction is moreover the symptom of the problem. It is the flamboyancy of the cause. The patient and those that are near witness and experience the effects. We are mostly equipped with, at minimum, the necessities to survive well through life. I am a portion of the vessel to help discover those tools within ourselves.”

Our Staff

Christian Castaneda, LCSW

Lead Therapist

Christian is a licensed clinical social worker and a certified trauma-focused cognitive behavioral therapist who specializes in treating addiction, trauma, depression, anxiety and other mental health issues. In leading our clinical team, Christian utilizes his multi-modality clinical focus and certification in the Seeking Safety model of treating substance abuse and trauma.

Christian joined our team from Promises Treatment Center’s program director and prior to that dedicated three years as a lead clinical specialist at Huntington Hospital.

His astute attention to client care and family focus is truly impactful on staff culture and the clients’ recovery experience at ASAP Rehab.

Jessica Madrigal, LVN


Jessica Madrigal moved from central California to the Los Angeles area to pursue a career in nursing. She graduated from St. Francis Career College and has been a state certified Licensed Vocational Nurse since 2012.

She first started her career as a pediatric home health nurse. In November 2016, she became the lead nurse at Alcohol and Substance Program.

Jessica is currently furthering her education to become a Registered Nurse. Her great passion is to provide excellent individual care and help those who have been through traumatic/stressful situations.

Recovery Support Team

Our Staff

Leslie Ferrari


Leslie Ferrari moved from central California to the Los Angeles area to continue a career in  Substance Abuse Counseling. She graduated from the University of Phoenix with her Bachelors of Science in Human Services in 2009.

She first started her career as a substance abuse Counselor working for Phoenix House of California in the California Department of Corrections.  She also continued in Substance Abuse working for a non-profit with group home children.

In 2016, she became residential Tech/Substance Abuse Counselor at Alcohol and Substance Program. She is certified under  Registered Addiction Specialist-Masters.   Her passion as a person in recovery is to provide quality services to those with addictions and co-occurring symptoms.

Edward Segura

12-Step Counselor

There is more to be said about Eddie shortly

Our Staff

Heshan Wijegunaratne, MHS

Compliance Officer

Heshan comes from a medically-trained background in the fields of psychiatry and addiction. He also has a Masters in Health Science and broad work experience in both inpatient psychiatric hospitals and in residential rehabilitation facilities.

In November 2016, Heshan joined our team as a program director, and after 1 year, he took over the position of compliance officer in order to enforce ASAP Rehab’s acclaimed JCAHO accreditation certification recognition. His attention to detail, knowledge of mental health, experience working in a variety of departments at ASAP Rehab, and a passion for helping individuals with addiction issues makes him a versatile and valuable member of our team.

Michael Gray

Executive Chef

Michael has dedicated himself for more than 15 years in the health care field. Following his passion and graduating from Le Cordon Bleu Culinary Academy, he has graced ASAP Rehab with a menu that would satisfy any client’s taste.

Prior to following his passion, he worked as a Certified Nursing Assistant for 8 years. Michael has built a culinary team at ASAP that couples his culinary skill with his expertise in treatment and medical practice that supports the nutritional clinical restoration for clients at ASAP. Michael is currently furthering his education by securing a degree in business.

He has also generously extended his talent to those struggling with addiction through the Salvation Army Treatment program supporting client care and the Project Open Hand meals with love organization to the sick and vulnerable.

Gary Sliva

Facility Maintenance Engineer

Gary’s skill and service to ASAP Rehab has gone beyond Facilities Maintenance over the past three years. Certainly, our clients can be assured a facility that is well-appointed, well-kept and in solid working order.

Gary’s resolve to help those who choose a path of recovery lend him the opportunity to build rapport, mentor and support the clients at ASAP while he is on the properties daily. His knowledge in and about sobriety for over 13 years gives clients an example of the life-changing path they are currently building.

Prior to working at ASAP, Gary was the Electrical Engineer at Lowes Santa Monica Beach Hotel after serving ten years in the United States Army in engineering.

We have expert addiction-specialists standing by ready to speak confidentially with you. Call us today!

Call Now! 833.827.ASAP (2727)