Pateman was an executive director and head of UK banking at Santander UK, running the firm’s corporate, commercial, business and retail banking operations along with wealth management.
Pateman’s hire at Shawbrook marks the second high-profile departure from Santander UK in recent months. The company’s chief financial officer, Stephen Jones, announced he would be stepping down over the summer.
Richard Pyman, who had held the top job at Shawbrook since April 2014, took a leave of absence this May, citing illness.
The bank said on Friday that Pyman would be stepping down as chief executive and from the board “with immediate effect”.