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Gregory Tiernan (born June 19, 1965) is an Irish-born, Canadian-based animator, director and voice artist. Along with his wife Nicole Stinn, he founded Nitrogen Studios Canada, Inc. in 2003, through which he introduced CGI to the Thomas & Friends series. Prior to this, Tiernan collaborated on various projects with filmmaker Don Bluth, Walt Disney Animation Studios and Klasky Csupo, Inc. Nitrogen Studios was purchased by Cinesite and he now works for them. Wikipedia