She is also a professor at Indiana University of Pennsylvania. Her professional experience includes working at Western Psychiatric Institute and Clinic for ten years prior to assuming her position at the university. Dr. Marshak works with adults and couples and is experienced at addressing a wide range of problems including anxiety, depression, self-worth, relationships and life transitions. In addition, she has an expertise in working with parents of children with disabilities on how to live well as a couple when faced with the intesified parenting demands that pose challenges to both couples and individuals. She has written numerous books on aspects to disability; many of these were with Dr. Milton Seligman who was her mentor in this regards and one of the founding partners of North Hills Psychological Services.