Turner-Tompkins will handle Rain’s retail and fashion clients, which include McArthurGlen Designer Outlets, working on strategy and implementation.
Starting off as an account executive at Edelman, Turner-Tompkins went on to become associate director at Halpern, where the client list included Tiffany and Co. and Sainsbury's.
Other big agency experience includes stints as associate director at Ketchum and Hill+Knowlton Strategies.
In her most recent role, Turner-Tompkins worked as comms director at Push PR, where she was head of beauty and agency support.
Delia Hyde, chief executive of Rain Communications, said: "We are delighted to welcome Lara to the team. She brings a wealth of experience and insight as well as creative and strategic flair that will be a huge asset to the business."