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About Us

Welcome to our Office  

Wiest Neuropsychology specializes in using evidence-based practices for the assessment and treatment of child, adolescent, and young adult neurodevelopmental disorders such as attention deficit hyperactivity disorder (ADHD), autism spectrum disorders (ASD), and learning disabilities (e.g., dyslexia, dysgraphia, and dyscalculia).   

We also offer customized psychotherapy for people of all ages for a variety of mental health challenges. Therapy has been shown to have benefits such as better relationships, solutions to specific problems, and significant reductions in feelings of distress. The therapist will assist clients in achieving their goals by using an eclectic set of interventions such as cognitive behavioral, person-centered, solution focused, narrative, hypnosis, and Eye Movement Desensitization Reprocessing (EMDR) therapies. We offer therapy for individuals, couples, and families.  

Our team members have extensive experience and are licensed psychologists, educational psychologists, or special education teachers. Moreover, several of our members have National Board Certifications, including clinical psychology, school psychology, school neuropsychology, and family therapy.  

Faculty at Our Center

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DUDLEY J WIEST, Ph.D., ABPP in School Psychology, ABSNP in School Neuropsychology,  Licensed Psychologist, Licensed Educational Psychologist, Credentialed as School Psychologist, Emeritus Professor and Coordinator of School Psychology Program at California State University, San Bernardino 25 years.


GRAHAMM WIEST, PSY.D. is a licensed psychologist and clinical neuropsychologist who provides evidence-based neuropsychological evaluations across the lifespan. In addition to his private practice, he currently holds a medical faculty position at Jonathan Jaques Cancer Institute (JJCCI) at Miller Children and Women’s Hospital in Long Beach, CA. As a faculty member of JJCCI, Dr. Wiest works specifically with patients with blood disorders and various cancers. He delivers outpatient and inpatient neuropsychological service to these patients, as well as providing inpatient consultation and liaison psychotherapy for admitted hematology and oncology patients. He is the associate training director for psychologists at JJCCI and supervises doctoral students in neuropsychology. 

Dr. Wiest received his doctorate from the California School of Professional Psychology in Los Angeles, California. He completed his APA-accredited internship at Western Youth Services and a formal 2-year neuropsychology fellowship at One Neuro Clinic. He received pre-doctoral neuropsychological training at Miller Children’s Hospital, Children’s Hospital, Los Angeles, and Hoag Presbyterian Hospital. 

From a theoretical orientation, Dr. Wiest utilizes cognitive behavioral and third wave approaches, such as process orient hypnosis, ACT, and CBT. 

Dr. Wiest’s publications and research focuses on cognitive rehabilitation and remediation of working memory and attentional skills. His research at JJCCI is ongoing, with projects related to cognitive rehabilitation for patients with late effects of chemotherapy and CNS brain tumors, pain management in sickle cell disease, and universal health access for minority patients. 

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JOSEPH CERVANTES, Ph.D., ABPP in Clinical Psychology, ABPP in Family Psychology, Licensed as Psychologist, Professor of Family Therapy, California State University 25 years. Fluent Spanish speaking. 

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DIANE L WIEST, M.A., ABSNP in School Neuropsychology.  Licensed as Educational Psychologist, Credentialed as School Psychologist.  Lead School Psychologist; Preschool Autism, in Placentia Yorba Linda School District 25 years. 


DEBRA JARVIS, M.A., Special education instructor and administrator for over 30 years. Trained in Slingerland and specialized approaches to reading intervention. 

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EUGENE WONG, Ph.D., Licensed Psychologist, Professor and Director of Child Development, California State University, San Bernardino, Member of CSUSB Neurodevelopmental Institute. Fluent Cantonese speaking. 


JESSIE KLINKENBERG, M.A., Associate Marriage and Family Therapist #131902, Under the Supervision of Dr. Dudley Wiest, Ph.D. Prior to working for Wiest Neuropsychology, Jessie spent 6 years working as a high school counselor and mental health specialist at a local private high school. Jessie specializes in working with teen girls and women.


KATIE MORRIS joined the practice as a part time assistant in January of 2020. She now manages the front office on an almost fulltime basis. Prior to Wiest Neuropsychology, she worked as a full time mom and, for almost 20 years, at First American Professional Real Estate Services as a software trainer, a business analyst and a sales representative. 

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