Truswell announced he was leaving Together in June.
John Truswell has joined Newcastle Building Society as head of intermediary mortgages.
Truswell (pictured) joins from Together where he was as head of national accounts.
At Newcastle Building Society, Truswell will lead a team of seven business development managers and key account managers.
Truswell said: “I’m looking forward to working with an exciting business that is focussed on growth and building long term relationships with brokers and their clients.”
Stuart Miller, customer director at Newcastle Building Society, added: “We’re very pleased to welcome John to the Newcastle Intermediaries team.
“He brings a wealth of experience and will be a great addition in helping us continue to build our intermediary market presence and impact through our expanding broker team.”
Truswell has more than 30 years’ experience in the mortgage intermediary market, having previously worked at Virgin Money, CHL, and Together.