Jeff Greenstein is an American entrepreneur and private investor based out of Seattle, Washington. Greenstein currently stands as the Founder and President of YIS Capital, an investment firm that seeks to build a diversified portfolio of idiosyncratic opportunistic investments. He is also the cofounder for both the Greenstein Family Foundation, a Seattle-based charitable giving foundation, and the Greenstein Lab, a multipurpose space for exhibiting and promoting contemporary art.
Jeff Greenstein began his investing career in 1984 when he took on a consultancy role with Merrill Lynch. After spending several years at the firm, Greenstein took his first strides as a corporate leader by stepping into an executive position at Behar Greenstein Incorporated. There, he was responsible for overseeing option trading on the Chicago Board Options exchange. Over the next several years, Greenstein went on to become the Vice President of the Institutional Derivatives division at Oppenheimer & Co.
In 1989, Jeff Greenstein co-founded Greenstein Rosenthal Capital, a relative value hedge fund. He served as the fund’s CEO until 1993, when he pivoted to co-found and helm his next initiative: Quellos Group, LLC. Quellos was a global alternative investment management firm that, at the time of its $1 billion acquisition by BlackRock in 2007, managed over $25 billion on behalf of leading institutional and private investors from across the globe.
In the years since Quellos’ acquisition, Jeff Greenstein has focused his attention on leading his current company, YIS Capital. At YIS, Greenstein leverages his three-plus decades of industry experience to make strategic, thoughtful investments in diversified alternative assets. He has also become a prolific writer and thought leader, with articles appearing in notable publications such as VentureBeat,TriplePundit, Business 2 Community, and Thrive Global.
Outside of his work in the financial sector, Jeff Greenstein is an avid philanthropist and active community advocate. Together with his wife, Judy, he has co-founded two community-centric organizations: the Greenstein Family Foundation, which focuses on driving meaningful change in the core areas of Jewish continuity, community support, medical research, education, and the arts, and the Greenstein Lab, which helps support and promote contemporary artists in the pair’s home city of Seattle. Going forward, Greenstein intends to continue his efforts in the financial and philanthropic sectors.