Matthew Patsky, a 25-year veteran of socially responsible investing, has joined Trillium Asset Management as its CEO.

Patsky, a chartered financial analyst, joined the firm on October 26. He came to Boston-based Trillium from Winslow Management Co., where he was director of research, chairman of the investment committee and portfolio manager for the Winslow Green Solutions Fund.

He began his career at Lehman Brothers in 1984 as a technology analyst. In 1989, while covering emerging growth companies for Lehman, Patsky began to incorporate environmental, social and governance (ESG) factors into his research, becoming the first sell side analyst in the United States to publish on the topic of socially responsible investing in 1994.

He later became director of equity research for Adams, Harkness & Hill, and built that firm's research capabilities in socially and environmentally responsible areas such as renewable energy, resource optimization, and organic and natural products.