David Mandell is a multi-time founder who co-founded and led venture-backed startups like PivotDesk and OneRiot before becoming an investor at Massive, giving him deep empathy for the challenges CEOs face when raising capital and managing boards. He runs VentureVoodoo Partners where he coaches founders on the psychological and cultural aspects of leadership, teaching that CEOs shape company culture through their daily actions and communication rather than formal authority. David Mandell is a multi-time founder who co-founded and led venture-backed startups like PivotDesk and OneRiot before becoming an investor at Massive, giving him deep empathy for the challenges CEOs face when raising capital and managing boards. He runs VentureVoodoo Partners where he coaches founders on the psychological and cultural aspects of leadership, teaching that CEOs shape company culture through their daily actions and communication rather than formal authority.