P eter Gilgan is a self-made Canadian billionaire and one of his country's most successful homebuilders. He is the founder and CEO of Mattamy Homes, the largest privately owned homebuilder in North America. An accountant by training, he founded the company in 1978, naming it after his two eldest children, Matt and Amy. He has since built the company into a massive enterprise with operations across Canada and in several major markets in the United States.

Mattamy Homes is known for its focus on building large-scale, master-planned communities with a wide variety of housing types. Gilgan's success is built on his sharp business acumen and his deep understanding of the suburban housing market. He is also one of Canada's most generous philanthropists, having given away hundreds of millions of dollars to various causes, with a particular focus on hospitals and healthcare research. He is a signatory of the Giving Pledge.