Primarily ATCA administrative files containing a vast amount of information on the sources of the ATCA collections and detailed records regarding grants won by and exhibitiions curated by ATCA staff prior to 2000.

Television and film writer, producer and director. 26 episodes of Galidor, an action series for children sponsored by Lego Media International and the Disney network; 13 episodes of Scout's Safari, an action-adventure series for young people set and shot in South Africa; materials relating to The Listener, for which Chehak served as an Executive Producer, shot in Toronto.