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The quartet was founded in 1989 at The Royal Conservatory of Music and has held residencies at the Juilliard School, Yale University, the University of Toronto, the Hartt School, and Stanford University. In 1992, the quartet won first prize in the Fourth Banff International String Quartet Competition and the Young Concert Artists International Auditions. They have won a Juno Award and a Preis der deutschen Schallplattenkritik for their EMI recording of Robert Schumann's quartets.
The quartet has recorded four CDs for EMI (composed of quartets by Pyotr Ilyich Tchaikovsky, Schumann, Dmitri Shostakovich, and Osvaldo Golijov). They have also release two CDs of Joseph Haydn quartets. They have premiered works by John Adams (January 2009), Ezequiel Viñao (December 2009), Osvaldo Golijov, David Bruce (work for clarinet and string quartet, commissioned by Carnegie Hall), Derek Charke, Suzanne Hebert-Tremblay, Brian Current, Elizabeth Raum, and Marcus Goddard.
They have also collaborated with composers R. Murray Schafer (premiere of String Quartet 3, in 1994 and "Four-Forty" in 2002), Jonathan Berger (premiere of "Miracles and Mud" in 2001 and "The Bridal Canopy" in 2008), Christos Hatzis ("Awakenings," May 2005), and Roberto Sierra ("Songs from the Diaspora," February 2007).
- The first violin chair is currently open following the death of Geoff Nuttall.
- Owen Dalby, second violin (joined May 31, 2015)
- Lesley Robertson, viola (co-founding member)
- Christopher Costanza, cello (joined September 2003)
- Geoff Nuttall, first violin and co-founding member of the quartet, died on October 19, 2022.
- Marina Hoover, cello (co-founding member) retired from the quartet in 2002.
- Scott St. John, second violin from 2006 through 2013.
- Barry Shiffman, second violin (co-founding member, until 2006).
- Mark Fewer, second violin (2013 to 2015).
- Alberto Parrini, cello (2002-2003).
- "Geoff Nuttall, First Among Equals in Acclaimed Quartet, Dies at 56". The New York Times. Archived from the original on 2022-11-14.
- "SLSQ announces new second violinist: Owen Dalby to join in June 2015". St Lawrence String Quartet.
- "Lesley Robertson". St Lawrence String Quartet. Retrieved 2023-11-06.
- "St. Lawrence Quartet changes cellists". The Globe and Mail. 2002-06-20. Retrieved 2023-11-06.
- Everett-Green, Robert (2006-01-20). "U of T's Scott St. John joins St. Lawrence Quartet". The Globe and Mail. Retrieved 2023-11-06.
- Reaney, James Stewart (26 November 2013). "Scott St. John's replacement in string quartet named". The London Free Press.
- "Barry Shiffman, B.M., ARCT". The Royal Conservatory of Music. Retrieved 2023-11-06.
- "St. Lawrence Quartet loses new cellist". CBC. 1 May 2003.