Lambert grew up in Canberra, where he attended Telopea Park High School and St Andrew's Presbyterian Church in Forrest.
[4] While still in the military, Lambert commenced theological studies at St Mark's National Theological Centre initially on a part-time basis, and later was discharged from the military with the rank of major to complete his studies full-time.
[4] Following his graduation, Lambert served in the Anglican Diocese of Canberra and Goulburn, first as curate at Cooma from 1995 to 1996, then was appointed rector of Batemans Bay in December 1996.
[4] In 2012, Lambert was appointed as assistant bishop in the Diocese of Goulburn and Canberra.
[3] Lambert was installed as Anglican bishop to the Australian Defence Force on 5 July 2013 by Phillip Aspinall in the chapel at Duntroon.