Mr and Mrs. Michael Dewey of Centreville are pleased to announce the engagement of their daughter, Leslie, to Johnathan MacQuilliam, son of Debbie and Michael MacQuilliam of Marshall, Va. Johnathan is a 1999 graduate of Fauquier High School and in 2003 received his bachelor's degree in finance from Longwood University. He is currently serving Fairfax County as a Firefighter at Fire station 409 in Alexandria. Leslie is currently working as an ER nurse for Reston Hospital Center and works part time as an EMT instructor for Training 911. A fall 2010 wedding is planned.