Sims will lead the growth of the lender’s mortgage and savings operations and help develop the mutual’s support for community-led housing.
He has over 30 years of experience in the retail banking and building society sector and has held roles at Royal Bank of Scotland and HBOS. During his time at the Co-op he held senior mortgage, distribution and network operations roles.
Sims replaces George Haslem, who retired from his position at the firm.
Paul Ellis, CEO of Ecology said: “I am thrilled to welcome Martin to Ecology. His wide-ranging and comprehensive experience will be a major asset to the Society.
“This is a critical role as we develop and grow our sustainable lending as well as supporting our savings members.”
Sims added: “I am looking forward to playing a key part in the future success and development of the Society and to help ensure that we continue to meet the needs of all of our members.”