Gideon is CEO of the National Theatre School of Canada (NTS), the only institution in Canada entirely devoted to providing professional training in all of the theatre crafts, in both official languages. He is currently the President of the Board of La Serre/OFFTA, and a member of the Steering Committee of the Canada Arts Summit. He served as a juror for the 2015 Siminovitch Prize for Excellence and Innovation in Theatre. Gideon was also General Manager of Tarragon Theatre and the Executive Director of the Toronto Fringe Festival, contributing significantly to the growth of the flagship festival.