Brett will start his new role on 16 September and joins Masthaven from personal asset lender borro.
He had been at borro since October 2010 and before that he spent three years as a consultant.
Before he was a consultant, Brett was head of the Freehold Packager Association and also managing director of lender FML.
Masthaven managing director Andrew Bloom says: “We are very pleased to welcome Paul to the management team at MSL.
“Paul comes to us with a great track record in business- development, proven over many years and with a variety of prominent companies, and his appointment is a vital catalyst to drive the growth of this business.”
Brett says: “This is an exciting time in the secured loan market and I am delighted to be working with Andrew Bloom, Stuart Aitken and the team at MSL.
“This is a lender with big ambitions to become an established force in the market and I am keen to use my knowledge and relationships to help MSL achieve success.”