Collyer will assume his role in December 2020.
Matthew Wyles, chief executive at HTB, said: “HTB’s ongoing success is underpinned by a strong risk culture.
“Paul Collyer has an impressive track record with a broad palette of experience across the whole waterfront of risk disciplines.
“Having spent the last twenty years working with global banks, challenger banks and leading non-bank financial institutions, he has deep knowledge of HTB’s key lending classes and is a perfect fit for us.
“I’m really looking forward to working with him.”
Collyer added: “The specialist lending sector is the most dynamic segment of the UK banking market and HTB is an outstanding player in that market.
“I am really looking forward to joining the strong team in place and contributing to the achievement of HTB’s exciting growth plans.”
Upon Paul Collyer’s arrival Clive Gavin, HTB’s current chief risk officer, will retire.