Mr Minter-Kemp led investment strategy and fund development at Cazenove Capital and prior to this he worked at HSBC Asset Management and Henderson Global Investors. He also holds an non-executive director role at River and Mercantile.
Geoff Mills, director of Rayner Spencer Mills Research, said: "Robin's impressive knowledge of the fund management world will be invaluable to us as we continue to drive our business forward and we are delighted to welcome him to the RSMR Board.
"Combining Robin's expertise with our existing team ensures we have the experience and skills to continue to bring fresh thinking and innovation to the ratings and investment research space."
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Mr Minter-Kemp said: "I have long been impressed with the strength and breadth of RSMR's offerings and the team's close work with fund groups and advisers to provide impartial, specialised fund research.
"At a time when we are seeing continuing concentration of investor wealth amongst an increasingly smaller group of fund managers, the professional adviser's need for impartial fund research in the area of portfolio construction has never been greater.
"The research and ratings sector remains in a growth phase and I relish the challenge to contribute to the company's growth plans, meeting the demand and helping to expand their impressive service level and competitive profile."