Publications. Motivating Behavioral Change in Fibromyalgia Williams, David & Marshak, Marissa. (2009). Motivating Behavioral Change in Fibromyalgia. 10.3109/9781420086805-9. Read Chapter DBT and Bereavement: A Multiple Baseline Design Marshak, Marissa, "DBT and Bereavement: A Multiple Baseline Design" (2015). Dissertations. 1645.Read Article