Sweet + Salt PR is based in York and currently works with local marketing agencies including Space Creative.
So far clients include The Wholeroast Ox Co and Savills on a freelance basis. Clark said she had also received interest from clients as far afield as Denver, Colorado.
Clark told PRWeek: "I’ve been in-house for more than five years and was ready for a new challenge.
"The agency will offer clients coverage in local, national and broadcast media. We will also be creating content for brands, managing social media for them and advising on product launch events."
Clark has held numerous high-profile positions, and was most recently PR director at Savills. Before this she worked as brand manager at Red Bull, where her responsibilities included overseeing advertising campaigns, media plans, PR launches, events and sponsorship.
Other agency experience included a three-year stint as account manager at The Red Consultancy where clients included M&S, Microsoft and Remy Martin.