Meet Your Instructors

Portrait of Darrell HudsonDarrell Hudson, PhD
Associate Professor, Brown School

Darrell Hudson’s research focuses on racial/ethnic health disparities and the role of social determinants of health, particularly how socioeconomic position and social context affect health and health disparities. He is currently investigating why data show that African Americans — despite bearing a disproportionate burden of physical health disparities and greater exposure to stress — have lower rates of depression compared to white Americans.

Portrait of Jack JacobsenJack Jacobsen, MSW, LCSW
Adjunct Faculty, Brown School
Clinician in Private Practice

Jack has been a clinician in private practice for the last five years, working with individuals and couples in distress. For the decade prior, he was a therapist within several local non-profit and government settings. In addition to his clinical work, Jack provides consultation and training to other mental health providers, leveraging his expertise in Acceptance & Commitment Therapy (ACT) and Integrative Behavioral Couples Therapy (IBCT).

Portrait of Jule Mastnak Julie Mastnak, PhD
Senior Lecturer, Brown School

At the Brown School, Julie Mastnak teaches Cognitive-Behavioral Therapy, Applied Behavior Therapy, Differential Diagnosis, and Cognitive Processing Therapy. Since 2006, she has worked on the Post-Traumatic Stress Disorder Clinical Team at the Veterans Affairs Medical Center in St. Louis, specializing in providing diagnostic assessments and evidence-based, trauma-focused treatment.


Portrait of Shannon LenzeShannon Lenze, PhD
Assistant Professor of Psychiatry
Washington University School of Medicine

Shannon Lenze’s research focuses on the identification and treatment of perinatal mood disorders, with the goal of developing psychosocial interventions for depression that reduce depressive symptoms in mothers and prevent adverse infant outcomes. Her work particularly focuses on women from impoverished backgrounds who have substantial barriers to health and mental health care.

Portrait of Ryan Lindsay Ryan Lindsay, MSW, LCSW
Associate Professor of the Practice & Assistant Dean for Social Work, Brown School

Ryan Lindsay's career has focused on training new and experienced providers in various evidence-based treatments, consulting with organizations on how to implement evidence-based programs, and aiding organizations in program development utilizing evidence-based principles. At the Brown School he chairs, teaches and advises students within the Mental Health concentration in the Master of Social Work program.


Portrait of Karen LoaizaKaren Loaiza, PhD
Clinical Psychologist, Department of Veteran’s Affairs

Dr. Loaiza’s expertise lies in clinical practice with an emphasis on providing quality, evidence-based care predominantly to the veteran population. She has significant knowledge in the assessment and treatment of those dually diagnosed with trauma and substance use disorders. Karen has specialized training in the treatment modalities of Prolonged Exposure, Cognitive Processing Therapy, and Motivational Interviewing.