EPR Trillium LLP Chartered Professional Accountants formally began operations in January 2016, after five independent partners joined forces to become the largest EPR accounting firm in Ontario. Our firms are located in London, Dorchester and Aylmer, providing a core service offering of accounting/assurance, taxation, and consulting. In addition, our firms provide ancillary services including bookkeeping and administration, tax compliance, estate planning, succession planning, accounting software consulting and training, business coaching, payroll, and many more.