Gunn has a philosophy called "state of good repair" where the first priority is to maintain infrastructure and equipment, making regular repairs where needed and retiring equipment from service at the end of its life-cycle. His tenure at the TTC was also marked by changes in management structure, which were criticized by some (including his successor, Rick Ducharme, in a July 1999 Toronto Star article). He also argued against new subway construction.
Toronto's only fatal subway train accident, the August 11, 1995, collision which claimed three lives, happened only eight months after Gunn became head of the TTC.
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David Gunn is also an American actor whose acting credits include The Convent (2000) and Vampire Journals (1997).