Mark Longsjo, LICSW

Mark Longsjo, LICSW

McLean Hospital Title
  • Senior Director, McLean SouthEast


Mark Longsjo, LICSW, is the senior director of McLean SouthEast, a satellite location of McLean Hospital in Middleborough. Mr. Longsjo joined McLean Hospital in 1999, when McLean SouthEast was established, and he was previously the program director of the adult psychiatric inpatient and hospital programs. He is a recipient of the 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.

Mr. Longsjo’s area of professional interest is in adult mental health, and he has longstanding clinical presence in McLean’s social work department, human rights committee, inpatient programs, partial hospital programs, and emergency department contracts.

Education & Training

  • 1992 BA, Colby College
  • 1994 MSW, Boston College Graduate School of Social Work
Board Certifications:
  • 1996 Licensed Independent Clinical Social Worker, Board of Registration of Social Workers, Commonwealth of Massachusetts


Phone: 774.419.1020
Office Address: McLean SouthEast - 23 Isaac Street, Middleborough, MA