Milner was a student at Carleton University in Ottawa when friends and colleagues founded the Great Canadian Theatre Company(GCTC) in 1975.

[6] He has directed his own work as well as Criminals in Love by George F. Walker; Odd Fish by Pamela Boyd; Stephen and Mr. Wilde by Jim Bartley; Brothers of the Brush by Jimmy Murphy; Bedtime Story by Seán O’Casey; The London Vertigo by Brian Friel; Our Country's Good by Timberlake Wertenbaker; On the Razzle by Tom Stoppard; and, in 2014, the world premiere of George F. Walker's The Burden of Self-Awareness.

[9] He holds a Bachelor of Arts in English, Carleton University (1975); and a Master of Arts in English and Cultural Studies, Carleton University (2002) — Thesis: “Political Theatre, Modernist Marxism, and the Avant-Garde”; Thesis Advisor: Paul Keen[10] Milner now lives in Regina, Saskatchewan, where his wife, Jennifer Brewin, is Artistic director of Globe Theatre.

[2][6] His play Facts, a murder mystery set in the Palestinian West Bank, premiered at GCTC in 2010 and was subsequently produced in Toronto and Vancouver; in London, U.K. (Time Out Critic's Choice), and in Istanbul (in Turkish); and for a 9-city tour through Palestine and Israel (in Arabic).

[12][13] Getting to Room Temperature — a one-person play about Milner's mother's polite quest for assisted suicide — toured for several years after it premiered at Ottawa's Undercurrents Festival in 2016.