USA: www.trustincornerstone.com CAN: www.trustcornerstone.ca Cornerstone provides end-to-end project management solutions across the US and Canada, in addition to general contracting and design-build services in Canada. Based in Mississauga, Ontario, and Boston, MA, Cornerstone was founded by Jim Christian, a well-known and highly respected industry leader. Jim and his team of experienced professionals are known for their customer-centric, nimble and adaptable approach from project planning through construction and closeout.