MUUS is the private investment company of serial entrepreneur and Tiger 21 Chairman, Michael Sonnenfeldt. Founded in 1998, MUUS invests across a range of asset classes, and places an emphasis on “triple bottom line” investing in opportunities with environmental and social impact alongside above-market returns. With over 40 years of experience, we approach all of our investments with a long-term perspective and are willing to work through even the most challenging circumstances.


Michael W. Sonnenfeldt


Kathleen Dunleavy

Vice President

Chris Wolff

Portfolio Manager

Ben Wolkon

Principal, Sustainable Investments


Michael W. Sonnenfeldt is an entrepreneur, investor, and philanthropist.  He is the founder and Chairman of TIGER 21. In the 1980s,  he conceived and initiated the Harborside Financial Center in Jersey City, NJ, the world's then-largest commercial renovation. He subsequently founded and led Emmes & Company, a real estate investment boutique specializing in buying distressed portfolios. He has decades of experience in the renewable energy sector, most recently as Chairman of Carmanah Technologies Corp., a public Canadian company that manufactures and  distributes solar products and systems. He holds Bachelor’s and Master’s degrees in Management from the Massachusetts Institute of Technology.

Kathleen Dunleavy is the Vice President and Chief of Staff at MUUS Asset Management Co. Kathleen has been with MUUS for over 30 years and is responsible for all aspects of administration, legal review and technology for MUUS and affiliated business ventures. Kathleen holds an MBA from Fairleigh Dickenson University.

Chris Wolff is the Portfolio Manager at MUUS Asset Management Co. Prior to MUUS, Chris was a Principal at MDR Capital Management, a long/short equity hedge fund where he was a senior analyst specializing in the financial sector. He also served as a financial sector senior analyst at Galleon Group and macro trader at Exis Capital. Chris holds a BA in Political Science from Princeton University.

Ben Wolkon is the Manager of Sustainable Investments at MUUS Asset Management Co. Prior to MUUS, Ben served as director of business development for a commercial solar startup and founded a partnership to provide solar power to Southern Rhode Island. Ben holds a BA in English from Brown University and an MBA with a Certificate in Sustainability from the Massachusetts Institute of Technology.