Big Hero 6 (2014) cast and crew credits, including actors, actresses, directors, writers and more. Grace Granville has been a professor at the San Fransokyo Institute of Technology for at least 20 years, having taught Wendy Wower and Trevor Trengrove among other … Photos of the Big Hero 6 (Movie) voice actors. See image of James Cromwell, the voice of Professor Robert Callaghan in Big Hero 6 (Movie). 18 images (& sounds) of the Big Hero 6 cast of characters. She is a strict, stern professor who is the dean of San Fransokyo Institute of Technology and Hiro Hamada's thermodynamics teacher. Professor Granville is a recurring character in the Disney XD show, Big Hero 6: The Series.