William Tiemersma graduated from Montréal's Conservatory of Music in 1976 as an organist, after studies with Bernard Bernard Lagacé, and after winning the John Robb Memorial Organ Comeptition, 1974. Tiemersma was hired by the downtown Unitarian Church of the Messiah in Montréal (at rue Sherbrooke and rue Simpson -- map), performed summer concerts at St Joseph's Oratory and made a number of broadcast recordings for radio, mainly for Radio-Canada.
Wilhelmina is mentioned in the Canadian Encyclopedia as one of the outstanding students of Bernard Lagacé.
- Charles W Eddis. "The Story of a Sacred Space: from Creation to Ruin". Canadian Unitarian and Universalist Historical Society, May 17, 1992. www.canadianuuhistoricalsociety.ca/Charles%20Eddis%20Story%20of%20a%20Sacred%20Space%20ver2.pdf.
- Ingrid Peritz. “A Transsexual’s Tragic Life”. Montreal Gazette/Ottawa Citizen July 7, 1997.
- Wilhelmina Tiemersma. Email 16 Mar 2008.
- "Our alternate Organist". Saint Ansgar's Lutheran Church. www.st-ansgars-montreal.ca/1_3_Music.php.