Megan Gallagher wanted to act since she was five. She took acting classes in high school. She attend the Juilliard where she received a B.A. She appeared in the Broadway cast of "A Few Good Men" where she won two theater awards (Theatre World and Outer Critics Circle Award for outstanding debut) for her Broadway performance in "A Few Good Men". After Juilliard, she worked with John Houseman's Acting Company and made her TV debut in the miniseries " George Washington". Almost gave up acting, then she won the "Hill Street Blues" (1981) role, which developed from a guest star to a regular
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In addition to her appearance in A Few Good Men, Megan appeared in the Broadway productions of Angel in America. She appeared in the National Tour of Cyrano. Off Broadway she appeared in Miss Julie, Pay, Come & Go and Tartuffe. Regional theatre includes The Constant Wife at the Guthrie and Pasadena Playhouse; Cat on a Hot Tin Roof at the Arena Stage; Oliver! Oliver! at Long Warf; Present Laughter and Man in His Underware at Williamstown Theatre Festival; Man and Superman, Major Barbara at Center Stage; Eugene O'Neill Playwrights Conference; Twelfth Night, The Country Wife at The Acting Company.
Television movies include: A Time to Remember, Homeland Security, 1st to Die, Underground Father, Best Friend Contagion.