Martin has practiced law in the firm since graduating in London in 1994 and is the third generation of the Hanna family to be a partner in the practice.

He specialises in civil litigation and heads up the firm’s litigation department. Martin specialises in asbestos related disease, clinical negligence, catastrophic brain and spinal injury cases. He was the solicitor involved in the first ever Periodical Payments case in Northern Ireland which ensured the cost of care will be paid every year for the remainder of the victim's life. He deals with all asbestos related mesothelioma cases for local victims and also those who were exposed to asbestos in Northern Ireland and now live throughout the world in places like Canada, the United States and Australia.