Dr. Marshall completed her doctorate degree in Clinical Psychology in 1998 from the California School of Professional Psychology (now known as Alliant International University), fully accredited by the American Psychological Association (APA).  She completed her pre-doctoral internship at St. Francis Medical Center located in Pittsburgh, Pennsylvania. The program, accredited by the APA, provided solid, broad clinical training with adults, adolescent and children in both inpatient and outpatient settings. The program also provided specialized training with outpatient forensic populations with varied mental health conditions, often co-morbid with substance abuse difficulties.

Following the pre-doctoral internship, Dr. Marshall completed formal postdoctoral residency training in both clinical and forensic psychology within the Division of Forensic Services at St. Elizabeth’s Hospital located in Washington, DC. She later served as the Director of Training and as a Supervisory Psychologist at St. Elizabeth’s Hospital. In this role she was responsible for the management and oversight of the hospital’s pre-doctoral psychology training program, accredited by the APA, and the APPIC approved post-doctoral training program. She also continued to provide services to forensic inpatients while in this role.

Since that time, Dr. Marshall has worked with veteran populations, maintained a private practice,  has served as a clinical subject matter expert and consultant with a Big Four consulting firm and has continued to receive specialized forensic training to further enhance her skills.  She offers extensive experience conducting forensic evaluations, providing consultation and expert witness testimony in both civil and criminal matters.