Jasinski's role will include heading up the marketing and new business team as well as general management duties.
Prior to joining Leo Burnett, Jasinski spent seven years at independent direct marketing agency Partners Andrews Aldridge in a new business role. During her time at the agency she was involved in account wins including Lexus, Vodafone and Airmiles.
She started her career at GGT, before moving to Rainey Kelly Campbell Roalfe, where she helped the agency to pull in accounts for Virgin, Lil-lets and The Times. She then moved below-the-line to Wunderman and later to EHS Brann.
Jasinski said: ""Leo Burnett is one of adlands great untold stories. The team of people who I will be working with are first class and they have a really positive approach to new business.
"I am looking forward to building on existing successes and taking the Leo Burnett brand onto greater heights."