Beth and Barry Dorsk on the engagement of their son, Justin to Erin Giblock. Justin is the grandson of Robert Dorsk of blessed memory and Peggy Dorsk, Jack Koonan of blessed memory and Barbara Krampf. Erin is the daughter of John and Cindy Giblock, and granddaughter of Harold and Susan Johnson of Lilly, Pa. Justin and Erin live in Arlington, Va. The wedding will take place in November.