Mr Cormack is a founding member of FoH and joins Foundation chairman Ian Murray MP a club owner Ann Budge remains committed to strengthening links between the club and supporters.
She intends to hand control of the club to the Foundation within four years.
Mr Cormack, 51 works in property and is one of the five who established Foundation of Hearts in 2010. He joins the board alongside Mrs Budge, Mr Murray, operations director Eric Hogg and director of football Craig Levein.
“Ann has said that she feels the club and the Foundation are one, and that’s exactly how we feel. Now, together, one of our main priorities will be to increase the number of supporters backing the club by pledging to the Foundation,” he said.
The Foundation of Hearts has more than 8000 members donating cash every month, which helps fund the club.