Our Team

Mastiff Group, led by Daniel Wainstein, Chief Executive Officer, combines the talents of its principals to bring together a high level of experience in finance and management. The principals of Mastiff Group have each been active in corporate and real estate finance for more than a decade, raising money for their own projects and on behalf of others. Additionally, they have been operators of public companies and real estate investment firms covering a broad range of sectors from defense to entertainment and from low income housing to large commercial properties.

To learn more, we invite you to view the profiles of our team by clicking on their names below:


Daniel Wainstein

Chief Executive Officer

Marissa Welner

Chief Strategy Officer

Jonathan Leinwand

Chief Operating Officer

Howard Moon

Managing Director

Mary Clare Bland

Director of Digital Marketing