Meet our team at Summit Malibu in beautiful Malibu, California where we have experience in treating drug and alcohol addictions, with great success.  We’re with you every step in the process from before and after treatment. Get to know our team below.


William Oswald, Chief Executive Officer, and Founder

Summit Malibu was founded by William Oswald, who has over 40 years of experience in the field of substance use, addiction treatment, and mental health recovery.

As a hands-on owner in recovery himself, William has handcrafted the Summit Malibu treatment program by drawing upon his extensive experience with proven methods for long-term success. Read More

Steven Booth

Steve Booth, Chief Financial Officer, and Founder

Steven earned his B.A. from the University of California, Santa Barbara in Economics. Before helping to co-found Summit Malibu Steven worked in both private and public accounting. Like many others, Steven has seen first hand the destruction that addiction can inflict on family and friends. He has also witnessed the extraordinary changes that can be made when addicts receive the necessary treatment.

Medical Team

Lisa Benya, D.O.

Dr. Lisa Benya, D.O., is a 1995 graduate of the Ohio University College of Osteopathic Medicine. She is an internal medicine doctor that has served the Malibu community for over the past 10 years.

Her caring and compassionate approach combines both eastern and western medicine and has earned her a great reputation and a lot of respect in the local community. Read More

William Stanley, M.D.

Dr. William D. Stanley, M.D., received his Doctorate of Medicine degree from UMDNJ – Robert Wood Johnson Medical School in Piscataway, NJ.

Dr. Stanley completed his Boards for ASAM (American Society of Addiction Medicine) in 2000, and later for ABAM (American Board of Addiction Medicine) in 2010. Read More

Shahla Modir, M.D.

Dr. Shahla Modir, M.D., has over 20 years of experience in addiction, psychiatry, and integrative medicine.

Dr. Modir is dual board-certified in Addiction and Psychiatry, serving as a diplomate of the American Board of Psychiatry and Neurology and its Addiction Psychiatry certification. Read More


Kristin Robert, Executive Director

Hailing from a background in business administration and customer service, Kristin Robert joined the team at Summit Malibu in January 2014.

As Executive Director, she oversees the clinical and support staff, as well as all aspects of our dual diagnosis addiction treatment program. Read More

Greg R

Greg Rigali, Director of Operations

Greg Rigali has been working in the field of substance use disorders and mental health treatment since 2015, and is currently the Director of Operations of Summit Malibu.

He has been instrumental in managing previous addiction treatment and support teams of nearly 100 staff members and up to 70 clients at a time. Read More

Joseph Neely, Admissions Director

Joseph Neely, better known as JoJo, is originally from Kentucky and is the Admissions Director of Summit Malibu.

For all prospective clients considering addiction treatment at Summit Malibu, chances are good that JoJo will be the first person you talk to about our program. Read More

Clinical Team

Terry O’Rourke, CADC, Group Facilitator

After a successful career in film & tv production, Terry felt it was time to give back. He has been blessed in his life with many gifts and felt it was time to be of service to others. Terry’s mission statement is “I co-create a world of connection and discovery through supporting, facilitating, and loving myself and others.” He graduated from the UCLA Extension Addiction Studies Program In 2018. Terry then became a Certified Alcohol and Drug Counselor. He is also a certified SMART Recovery Facilitator.

Support Staff

Joanna Medina

Scott Naslund, Lead Clinician Assistant

Scott is a graduate of UCLA and has been working at Summit Malibu since its inception. His experience in recovery has been both challenging and rewarding. The challenge has lied in helping people through the throes of addiction by being supportive. The reward from witnessing people heal through Summit’s therapeutic process and rekindle their fire for life. His passion for learning has helped him realize the importance of helping people and the value of sobriety.

Benjamin Hess, Clinician Assistant

Ben is an LA native, growing up on the hard streets of Chatsworth. He is currently working and is almost finished with his Bachelor’s degree in Psychology at CSUN. He finds joy in helping out others which he carries out with his work at Summit in hopes of furthering his career in the field

Jeffrey Moreno, Clinician Assistant

Jeffrey is coming up on three years of sobriety in July. He has replaced his old addictions with new ones: exercise and healthy eating. However, he still indulges in his favorite past time, which is a delicious in n out burger. He enjoys helping others who suffer from addiction to find new freedom away from drugs and alcohol.