David Dalton-Brown has been appointed director general with immediate effect.
He has been a non-executive director of TISA, which has 147 members drawn from every part of the financial services industry, for three years.
Mr Dalton-Brown also holds a number of non-executive posts at Barclays, where he was director of Barclays funds until 2013.
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Prior to that, he has held senior positions at Fidelity, KPMG Norwich Union and the Prudential.
He takes over from Tony Vine-Lott who last year stood down from the role at TISA.
Mr Dalton-Brown said: "I am delighted to be taking on this role. TISA has an important role to play in delivering effective policies, products and services to savers in the UK as it has a distinct perspective to both trade associations and consumer groups.
"Our membership provides an ideal platform from which to tackle the important challenges that the industry and its customers face."
Clive Shelton, TISA deputy chairman and chair of the nomination committee, said: "Ultimately, David's broad experience of the UK financial marketplace, proven executive track record and knowledge of TISA and our activities makes him the ideal person to take our organisation forward."
Tony Solway, TISA chairman, said: "He brings a number of important qualities to our Association and I look forward to working with him in the future and to making a positive difference to UK savers and investors."
TISA's mission is to encourage individuals to have the appropriate savings and investments to support them, and their families, throughout their lives. 

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