McCOLLOCH MARK DAVID, Ph.D. On Friday, October 26, 2018, of Towson, age 70. Beloved husband of Rachele Lawton; devoted father of William McColloch and his wife, Wendy Woodland, and David McColloch; cherished son of the late Robert and Lemoyne (nee Bryant) McColloch; dear brother of Karen Dillon, Joyce Tillman, and the late Jill McColloch; nephew of William Bryant; uncle of Christopher Barcelona, Tessa Dillon and Shawna Green; also survived by many loving friends. A celebration of life will be held on Saturday, November 17, at 1 p.m., at the SNF Parkway Theatre, located at 5 W. North Avenue, Baltimore, MD 21201. In lieu of flowers, please consider remembering Mark with memorial contributions to the Appalachian Trail Conservancy or Planned Parenthood. Send condolences post-gazette.com/gb