A Storied Past, A Promising Future. O’Connor MacLeod Hanna LLP has now entered its fifth decade of helping clients meet their business and professional goals. Proudly, OMH continues to grow along with the communities it serves. It was in 1991 that Oakville’s two most formidable law firms decided that they could better serve the rapidly expanding community by joining forces. Each with twenty years experience, O’Connor Leitch Hays and MacLeod Knox Watts merged. Emerging areas of law could now be addressed along with conventional practice.