Team

Clinical Neuropsychologists


Ari Kalechstein, Ph.D., President

ari kalechsteinAri Kalechstein, Ph.D., is a Clinical Neuropsychologist. He has been licensed to practice psychology in California since 1996. He founded Executive Mental Health, Inc. in 1998, with a focus on neuropsychological issues across the lifespan, including the evaluations of adolescents, adults, and older adults/seniors. Dr. Kalechstein is licensed in both California and Nevada.

Dr. Kalechstein graduated from California State University, Northridge, with a Bachelor of Arts degree in Psychology. He then completed a Master of Arts degree and a Doctorate of Philosophy degree in Clinical Psychology from Emory University in Atlanta, Georgia. Dr. Kalechstein completed a clinical psychology internship at the West Los Angeles, V.A. Medical Center. He then completed two postdoctoral fellowships at the UCLA School of Medicine, Neuropsychiatric Institute and Hospital, in clinical neuropsychology and addiction.

Dr. Kalechstein is currently an adjunct associate professor at Baylor College of Medicine, Department of Psychiatry, in Houston, Texas. He has served as the primary editor of the first book that focused on neuropsychology and substance use, has coauthored over 45 peer-review manuscripts and 10 book chapters, and serves as a consulting editor to the Journal of Clinical and Experimental Neuropsychology. Moreover, Dr. Kalechstein serves as an ad-hoc reviewer for over 26 peer reviewed scientific journals in the fields of addiction, psychology, neuropsychology, psychiatry, and neurology.


Dylan Harwood, Ph.D.

Dylan HarwoodDylan Harwood, Ph.D., is a Clinical Neuropsychologist and has been licensed in California since 2004. He joined Executive Mental Health, Inc. in 2004, with a focus on neuropsychological issues across the lifespan, including evaluating adolescents, adults, and older adults.

Dr. Harwood graduated from the University of California, San Diego with a Bachelor of Arts degree in Psychology. He then completed a Master of Arts degree in Marital, Family, and Child Psychology at Loyola Marymount University and a Doctorate of Philosophy degree in Counseling Psychology from the University of Miami. Dr. Harwood completed a clinical psychology internship at the West Los Angeles, V.A. Medical Center, and a postdoctoral fellowship at the UCLA School of Medicine, Neuropsychiatric Institute and Hospital, with a dual focus on neuropsychology and geriatric psychology.

Dr. Harwood is currently an adjunct professor at Nova Southeastern University, Fischler Graduate School of Education and Human Services, in the Child Youth Studies and Human Services Program. He is also a member of the research faculty in the Division of Psychiatry and Biobehavioral Sciences at the David Geffen School of Medicine at UCLA. He participates in clinical research and supervises pre- and post-doctoral students in Clinical Neuropsychology, Psychiatry, and Neurology. Additionally, Dr. Harwood is a research associate for the Wien Center for Alzheimer’s Disease and Associated Disorders, Mount Sinai Medical Center, and the University of Miami School of Medicine. In addition to participating in ongoing research, Dr. Harwood serves as an ad-hoc reviewer for over 10 peer reviewed scientific journals in the fields of psychology, psychiatry, epidemiology, and neurology. He is a founding member of the Center for Neurocognitive Wellness, a not-for-profit organization aimed at developing computer based interventions to be utilized by older adults to decrease the likelihood of developing significant age-related neurocognitive deficits.


Lorraine Leskin, Ph.D.
Lorraine LeskinLorraine P. Leskin, Ph.D., is a Clinical Psychologist with specialty training in neuropsychology and geriatric medicine. Dr. Leskin has been licensed to practice psychology in the State of California since 2011. Dr. Leskin earned a Bachelor of Arts from the University of California, Berkeley. Subsequently, Dr. Leskin worked in clinical research at the Psychophysiology and Sleep Laboratory at the National Center for PTSD, VA Palo Alto Health Care System and at Stanford University’s Aging Clinical Research Center. In 2007, Dr. Leskin was awarded a Ph.D. in clinical psychology from the University of Oregon. Her dissertation focused on the assessment of neurocognition in individuals diagnosed with post-traumatic stress disorder (PTSD). Dr. Leskin then completed an APA approved clinical psychology internship at the VA Greater Los Angeles Healthcare System, Sepulveda Ambulatory Care Center. Next, she completed a postdoctoral fellowship in clinical neuropsychology and rehabilitation psychology through Fullerton Neuropsychological Services at St. Jude Medical Center, Fullerton, in which she worked in an acute inpatient setting for brain injury, stroke, spinal cord injury and general medical populations. She then completed a research fellowship in geriatric neuropsychology at VA Greater Los Angeles Healthcare System, which focused on research with Alzheimer’s disease, vascular dementia and related dementias using a combination of neuroimaging, neuropsychological testing, and neuropsychiatric interviews. Dr. Leskin has published the results of her research in multiple peer reviewed journals.

Po-Haong Lu, Psy.D.

Po-Haong Lu, Psy.D., is a Clinical Neuropsychologist and has been licensed in California since 2003.  He joined Executive Mental Health in 2015, with a focus on neuropsychological issues related to aging and various neurological disorders, including evaluating adults and older adults.  Dr. Lu is bilingual in English and Chinese (Mandarin and Taiwanese dialects).

Dr. Lu obtained his Bachelors of Science degree in Psychobiology from the University of California, Los Angeles and his Doctorate of Psychology degree in Clinical Psychology from Pepperdine University.  He then completed a postdoctoral fellowship in Clinical Neuropsychology at Harbor-UCLA Medical Center.  Upon completion of the fellowship, Dr. Lu joined the faculty at the UCLA School of Medicine in the Department of Neurology.  He directed the Neurocognitive Testing Clinic in the UCLA Neurology Service for over a decade where he conducted and supervised the neuropsychological assessment of adult and elderly patients with neurological disorders.  Dr. Lu’s clinical and research interests include characterizing the cognitive and behavioral changes associated with normal aging and neurodegenerative disorders, such as Alzheimer’s disease and frontotemporal lobar degeneration.  He has authored or co-authored over 80 peer-reviewed research papers and 10 book chapters, and he has served as an ad-hoc reviewer for over 10 peer-reviewed scientific journals in the fields of neuropsychology, psychiatry, aging, and neurology.


Susan Bihrle. Ph.D.

Susan BihrleSusan Bihrle, Ph.D., is a Clinical Neuropsychologist and has been licensed to practice psychology in California since 2001. She has extensive experience in addressing neuropsychological issues across the lifespan including evaluating adolescents, adults and older adults. Dr. Bihrle graduated from Northwestern University with a Bachelor of Arts degree in Psychology. She then earned Master of Arts and Doctor of Philosophy degrees in Clinical Psychology from the University of Southern California. She completed a clinical psychology internship at the West Los Angeles V.A. Medical Center. She then completed a postdoctoral fellowship in neuropsychology at the UCSF Department of Psychiatry and a postdoctoral fellowship in forensic psychology at the USC Institute of Psychiatry and Law.

Prior to her employment with Executive Mental Health, Inc., her work experience has included conducting evaluations of children and adolescents in the L.A. County foster care system, evaluating and treating veterans at the West Los Angeles V.A. Medical Center, and conducting evaluations of inmates for the California Department of Corrections and Rehabilitation. She has co-authored more than 10 peer-reviewed research articles in the areas of neuropsychology, psychiatry and criminal behavior.


Stacey M. Bayan, Psy.D.

Stacey Bayan, Psy.D., is a Clinical Neuropsychologist who has been licensed in the state of California since 2015.  She has received training in treating a diversity of populations across the life span as well as specialized training in neuropsychological assessment, rehabilitative issues and severe mental illness. Her research work has spanned across various neuropsychological topics including traumatic brain injury, dementia, effort testing, and mental illness.

Dr. Bayan graduated from California State University, Fullerton with her Bachelor of Arts in Psychology.  She subsequently completed a Master of Arts degree at California State University, Northridge in Clinical Psychology with an emphasis in psychological assessment.  She received her Doctorate of Psychology from Virginia Consortium Program in Clinical Psychology where she emphasized in neuropsychological assessment.  Her dissertation focused on the neurocognitive factors of Transcranial Magnetic Stimulation in the treatment of depression. Her clinical psychology internship was completed at the University of Missouri, Missouri Health Sciences Psychology Consortium where she received training in rehabilitation psychology and neuropsychological assessment.  Her postdoctoral fellowship was completed at Patton State Hospital where she provided neuropsychological consultations to geriatric, medically fragile, neurological and psychiatric inpatients. She also participated in research related to effort testing and verbal learning in the psychiatric inpatient population, which resulted in publications in peer-reviewed journals.


Cynthia Aguilar, Psy.D.

Cynthia Aguilar, Psy.D., is a Clinical Neuropsychologist. She has been licensed to practice psychology in California since 2015.  She joined Executive Mental Health, Inc. in 2016, with a focus on geriatric and cross cultural neuropsychological issues.  Dr. Aguilar graduated from the University of California, Los Angeles with a Bachelor of Arts degree in Cognitive Science, and a specialization in Computing. She completed both her Master’s of Arts degree in Clinical Psychology and Doctor of Psychology degree from Indiana University of Pennsylvania.  Dr. Aguilar completed a clinical psychology internship with specialized training in Geropsychology at the Miami VA Healthcare Center.  Dr. Aguilar then completed a two-year neuropsychology fellowship in clinical neuropsychology at Patton State Hospital, where she specialized in forensic issues, neuropsychological evaluations with monolingual Spanish speakers, and geriatric neuropsychology.  Dr. Aguilar has published research on cross cultural neuropsychology and forensic neuropsychology.


Jayne D. Hagen, Ph.D.

 

 

 


Brandon Chuman Psy.D.


Earl Thorndyke III, Ph.D.

Earl Thorndyke, Ph.D., is a Clinical Neuropsychologist licensed in California. He has experience in addressing neuropsychological and psychological issues across the lifespan, including evaluating adolescents, adults, and a particular emphasis on working with older adults.

Dr. Thorndyke graduated from Chapman University with a Bachelor of Arts degree in Psychology. He then earned a Master of Arts degree and Doctor of Philosophy degree at Loma Linda University.  Dr. Thorndyke completed his internship in clinical psychology at the Phoenix Veterans Affairs Healthcare System.  He went on to complete a two-year postdoctoral fellowship in neuropsychology at the UCLA Semel Institute for Neuroscience and Human Behavior, where he specialized in geriatric neuropsychology and assessment of individuals with neurodegenerative diseases.

 


Tamara Obregon Madera, Psy.D.


Clinical Psychologists


John Y. Lee, Ph.D.

John Y. Lee, Ph.D., is a Clinical Psychologist and has been licensed to practice in the state of California since 2012.  He joined Executive Mental Health, Inc. in 2014 after two years of employment at Tarzana Treatment Centers as the clinical supervisor in the inpatient residential wing.  At EMH, Dr. Lee provides psychological services such as, offering initial psychodiagnostic interviews, ongoing individual psychotherapy, and crisis interventions.

Dr. Lee graduated from the University of California, Los Angeles, in 2002, with a Bachelor of Arts in Psychology and a Bachelor of Science in Biochemistry. He then matriculated at Fuller Theological Seminary, completing a Master of Divinity then completing a Master of Psychology and Doctorate of Philosophy of Clinical Psychology at the Fuller Graduate School of Psychology. He received training in geropsychology during his pre-internship year at the VA Greater Los Angeles Healthcare System, Sepulveda Ambulatory Care Center and completed his predoctoral internship and postdoctoral internship at Tarzana Treatment Centers.


Michelle C. Feng, Ph.D.

Michelle C. Feng, Ph.D., is a Licensed Clinical Geropsychologist with a focus in behavioral health.  Dr. Feng graduated magna cum laude from the University of California, San Diego, with a Bachelor of Science degree in Psychology.  She earned an M.A. and Ph.D. in Clinical Science from the University of Southern California.  Dr. Feng completed her internship and a postdoctoral fellowship in clinical geropsychology at the Boston V.A. Medical Center, with an emphasis in behavioral medicine. She has formal training and experience in implementing evidence-based treatments for issues such as depression, anxiety, PTSD, and chronic pain.  She regularly provides therapy geared toward coping with acute and chronic medical illnesses, adapting to different stages of cognitive impairment, and promoting healthy lifestyles.

Dr. Feng is currently an Assistant Clinical Professor at the University of California, Los Angeles (secondary appointment) and an adjunct lecturer at the University of Southern California, where she teaches and supervises Ph.D. level psychology graduate students in their clinical work. Dr. Feng has authored publications in peer-reviewed scientific journals including Psychology and Aging, the Clinical Gerontologist, and the Archives of Clinical Neuropsychology.


Elazar Tehrani, Psy.D.

Elazar Tehrani, Psy.D., is a Clinical Psychologist licensed in California, and has been practicing assessment and psychotherapy since 2012. Dr. Tehrani is bilingual in English and Farsi. Dr. Tehrani treats individuals across the lifespan, including older adults. Dr. Tehrani graduated from the University of California, Los Angeles with a Bachelor of Arts degree in Psychology. He then completed a Master of Arts degree and Doctorate of Psychology in Clinical Psychology at The Chicago School of Professional Psychology. Dr. Tehrani completed a clinical psychology internship at Canyon Ridge Hospital, while treating adolescents, adults, and geriatric patients suffering from severe mental illness.

 

 


Mona S. Ketabchi, Psy.D.

Mona Ketabchi, Psy.D., is a Clinical Psychologist. Dr. Ketabchi has been licensed to practice psychology in the State of California since 2016.  Dr. Ketabchi is bilingual in English and Farsi. Dr. Ketabchi earned a Bachelor of Arts from Rutgers University in New Jersey. She then completed a Master of Arts degree in Counseling at Montclair State University in New Jersey and obtained a second Master of Arts degree in Clinical Psychology at American School of Professional Psychology at Orange County in California, formerly known as Argosy University. Ultimately, Dr. Ketabchi received her Doctorate of Psychology in Clinical Psychology from the American School of Professional Psychology.  Dr. Ketabchi completed a doctoral psychology internship and post-doctoral fellowship at Sutter Health Hospital System in Sacramento, California where she delivered clinical therapy services (individual and group therapy), crisis services, 5150 evaluations and psychological assessments to children, adolescents and adults within an emergency room, inpatient, Intensive-Out-Patient and Partial-Hospitalization-Program setting.


Jennefer S. Ho, Ph.D.

Jennefer S. Ho, Ph.D., is a Clinical Psychologist licensed to practice in California. She has extensive experience working in behavioral medicine and health psychology throughout her clinical training and has worked with individuals dealing with a multitude of chronic health issues.  Dr. Ho completed her undergraduate degree in Psychology at UC Berkeley and received her Ph.D. from UC San Diego. She then completed a predoctoral internship at the VA Long Beach Healthcare System and a postdoctoral fellowship with a specialization in Liver Health/HIV/Substance Abuse. She has co-authored over 10 empirical peer-reviewed articles and book chapters with colleagues in the areas of health psychology and clinical psychology.

 

 


Stacy Ann C. Aquipel, Psy.D.

Stacy Ann Aquipel, Psy.D., is a Clinical Psychologist specializing in older adults.  After graduating with a Bachelor of Arts degree in Psychology from The College of William and Mary, Dr. Aquipel completed a Master of Arts degree and a Doctorate in Clinical Psychology from The Arizona School of Professional Psychology at Argosy University, Phoenix.  Dr. Aquipel then completed a clinical psychology pre-doctoral internship and a post-doctoral geropsychology fellowship at Sharp HealthCare in San Diego, which offers psychological services from an inpatient psychiatric setting to intensive outpatient treatment.  Dr. Aquipel also has prior training and experience in community mental health services, substance abuse rehabilitation, and outpatient treatment for military veterans.


Jared M. Grant, Psy.D.


Jesse Caldera, Ps


John Garry, Ph.D.


Audrey Martinez, Ph.D.