Whittle has joined from Together Money where he was director of finance, while before that he spent eight years as finance director at Close Brothers Motor Finance and two years as finance director at GE Money auto division.
Whittle said: “I bring energy, enthusiasm and passion to this role but also significant experience of transforming finance functions and building engaged and high performing teams.
“Having lived in Leeds for over 20 years I am thrilled to be joining a local institution which is a significant financial services business both regionally and nationally.
“I am delighted to be joining the society at this exciting stage in its ongoing development and look forward to helping contribute to future successes.”