3 Best Psychologists in Temecula, CA

“2026 Update: Dr. Frederick Lopez utilizes Cognitive Behavioral Therapy (CBT), Dialectical Behavior Therapy (DBT), Acceptance and Commitment Therapy (ACT), and mindfulness-based practices in his work. He also provides family therapy, adapting interventions to the needs of children, adolescents, and adults across different life stages. Dr. Frederick Lopez earned his Doctor of Psychology (PsyD) from Ryokan College and completed additional training at Catholic Charities in 2012. He has experience training future clinicians in ethics and the implementation of best practices in psychology. He works with individuals exploring gender identity, cultural concerns, and affirming self-expression. Dr. Frederick Lopez serves clients aged 0–65+. He offers telehealth services and provides care in both English and Spanish.”

“2026 Update: Dr. Hifa Alnajjar is a clinical psychologist and life coach who offers both online sessions and in-person appointments. She works with individuals, couples, and families to improve mental well-being, address challenges, and develop a greater sense of balance. She completed her pre-doctoral training in Clinical Psychology at Walden University and earned her master’s degree in Psychology from the University of Phoenix. Dr. Hifa Alnajjar uses cognitive behavioral therapy to support individuals experiencing anxiety, depression, and relationship difficulties, while also helping clients better understand their emotions and strengthen their connections with others. She practices at Psych Partners, where a team of clinicians provides a range of therapy services across multiple areas of mental health and offers treatment options tailored to individual needs.”

“2026 Update: Dr. Mark D. Diamond completed his undergraduate studies at UC Davis. He earned his master’s degree and PhD in 1981 from the California School of Professional Psychology in Berkeley, CA. He received a fellowship with the U.S. Navy after completing his graduate training. He worked at the Naval Hospital in Bethesda, Maryland, and at Miramar Naval Air Station in San Diego. He has over 30 years of experience as a practicing psychologist. He has provided psychotherapy to individuals, couples, and families. He uses a primarily psychodynamic approach in his work. He also incorporates cognitive restructuring and behavioral therapy techniques. He works with adults, adolescents, and children.”