Tecogen Inc. announced the appointment of Ms. Susan Hirsch to the Board of Directors to serve as an independent non-employee director of registrant to fill a vacancy in registrant?s board of directors. Ms. Hirsch was formerly Managing Director and Portfolio Manager for the TIAA Large Cap Growth Fund. Over the 15 years that she managed the fund, the assets under management grew to more than $20 billion.

She is presently on the board of Agenus. Ms. Hirsch has over 40 years of experience in investment management and finance. Since 2020, she has served as a member of the Board of Directors and the Audit and Finance Committee of Agenus Inc. and she serves as a Trustee for the Baruch College Fund.

From 2005 until February 2021, Ms. Hirsch was a Managing Director and Portfolio Manager at Nuveen Asset Management LLC, where she was responsible for managing over $20 billion in assets including the TIAA-CREF Large-Cap Growth Fund. Prior to joining Nuveen, she served as Executive Vice President and Portfolio Manager for the Mid-Cap Growth and Technology Sector portfolios at Jennison Associates. Ms. Hirsch?s previous experience also includes investment management positions at Lehman Brothers Global Asset Management and Delphi Asset Management as a Senior Portfolio Manager for the Selected Growth Stock Portfolio.

She began her career as an analyst at Smith Barney and Lehman Brothers where the success of her quantitative model led to her subsequent recognition as a top ranked institutional analyst for small cap growth stocks in 1991, 1992 and 1993, and holds a BS in Accounting from Brooklyn College. Ms. Hirsch brings extensive investment and financial experience to Board.