Mark Longsjo, LICSW

Mark Longsjo, LICSW


Mark Longsjo, LICSW, is the program director of the adult psychiatric programs at McLean SouthEast, a satellite location of McLean Hospital in Middleborough, where he oversees the inpatient and partial hospital programs. Mr. Longsjo joined McLean Hospital in 1999, when McLean SouthEast was established, and he has been in his current position since 2007. 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
  • 1996 Licensed Independent Clinical Social Worker, Board of Registration of Social Workers, Commonwealth of Massachusetts


McLean SouthEast - 23 Isaac Street, Middleborough, MA