Lynch joins Radius from Morris Nicholson Cartwright Advertising, where he held the position of senior art director.
He will now head up the company's creative team, working on a number of accounts including Siemens, EnTech and Pfizer.
Lynch spent a majority of his career working in Canada with agencies Young and Rubicam and Northern Lights Communications Group, with clients such as Coke and Visa.
Lynch said: "With a string of recent client wins, this is a very exciting time to be joining the agency. Radius has a diverse range of clients and I am looking forward to working in such a dynamic environment and helping support the company in its continued growth."