McWilliams has enjoyed a successful performing career, having performed in over a dozen countries, and has been an award winner at competitions of Porto (Portugal), the Regina Symphony, the Canadian Music Competitions and the Canadian National Competitive Festival of Music. He performs and records chamber music as a member of the Meridian Trio.
McWilliams joined the faculty at St. Olaf after having previously held teaching positions at Wilfrid Laurier University in Waterloo, Canada and at the Glenn Gould Professional School in Toronto. Also active as a clinician, he has presented performance and pedagogy workshops across North America.