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Division of Depression and Anxiety Disorders

McLean SouthEast Adult Psychiatric Partial Hospital Program

Program Leadership

Mark Longsjo, LICSW


Mark Longsjo, LICSW, Program Director

Mr. Longsjo oversees the adult inpatient and partial hospital programs at McLean SouthEast (MSE). He joined McLean Hospital in 1999 when MSE was established and has led the program’s growth over the years to serve more patients with enhanced services over a wider geographic area. He is a recipient of McLean’s Vision of Excellence Award and the Partners in Excellence Award and has been a member of the President’s Cabinet, the hospital’s leadership group.

Jeffrey D. Rediger, MD, MDivJeffrey D. Rediger, MD, MDiv, Medical Director

Dr. Rediger has served as medical director for MSE since 2004. He is also an instructor in psychiatry at Harvard Medical School. He has a Master of Divinity degree from Princeton Theological Seminary and publishes in the fields of medicine, psychiatry, and spirituality. His work has been featured on the Oprah and Dr. Oz television shows, among others.

Darlyn M. Scott, MSN, RN-BCDarlyn M. Scott, MSN, RN-BC, Nurse Director

Ms. Scott has been the nurse director of MSE’s Adult Psychiatric Program since 2011, overseeing a comprehensive inpatient nursing department. She previously worked for the Massachusetts Department of Mental Health in supervisory roles, including nurse manager at Lemuel Shattuck Hospital and nurse manager in the geriatric psychiatric unit at MetroWest Medical Center.

Duncan C. Maccourt, JD, MDDuncan C. MacCourt, JD, MD, Associate Medical Director

Dr. MacCourt currently serves as the attending psychiatrist for the adult partial hospital program at MSE and is an instructor in psychiatry at Harvard Medical School. Fellowship trained in cancer psychiatry, he publishes in the fields of medicine, psychiatry, and law. He teaches in the Harvard South Shore residency program and at Harvard Law School, where he is a lecturer.

Simona Sava, MD, PhD


Simona Sava, MD, PhD, Assistant Medical Director

Dr. Sava is a board certified psychiatrist specializing in the treatment of adult mood, anxiety, and psychotic disorders. Her clinical interests include the neurobiology of mental illness, psychopharmacology, quality improvement, cross-cultural psychiatry, collaborative care, and medical education. In her clinical practice, she uses a multifaceted approach that integrates biological, psychological, social, and cultural aspects to provide comprehensive, patient-centered care.

Staff and Associates

Each member of our highly trained team has an extensive background in treating adults with psychiatric illness and experience working with patients from diverse cultural and socioeconomic backgrounds from across the country and around the world. Working in close partnership with patients and families, our clinicians provide high-quality care tailored to each individual’s needs.

Our multidisciplinary staff consists of board-certified psychiatrists, licensed psychologists and clinical social workers, registered nurses, expressive therapists, and mental health specialists.