Dr. Thein is licensed to practice psychiatry in Massachusetts and New Hampshire and is Board Certified in both adult and child and adolescent psychiatry. In addition to her practice at The Counseling Center of Nashua, Dr. Thein is on staff at Children's Hospital, Boston, and is an instructor at Harvard Medical School.

Dr. Thein obtained her medical degree from the Pennsylvania State University School of Medicine. She completed her residency in Adult Psychiatry at the Harvard Longwood Psychiatry Residency Training Program. Following her residency at this program, she was on staff at University of Massachusetts as an Assistant Professor of Psychiatry. She attended and completed a Child and Adolescent Fellowship at Children's Hospital, Boston, where she continues to teach medical students, residents and fellows.

Dr. Thein maintains a practice treating the complete range of ages and a wide range of conditions. She has specialty interests in the psychopharmacologic treatment of depression, anxiety, obsessive compulsive disorder, attention deficit disorder, and also many topics related to children and adolescents.