David 'Dave' A. Duffield is an American businessman, the self-made billionaire founder of PeopleSoft and Workday, two of the most influential enterprise resource planning (ERP) and Human Capital Management (HCM) software companies in history. His background is rooted in engineering and computer science.

Duffield's career is defined by his serial entrepreneurship and his fierce competitive spirit, particularly against Oracle. Recognizing the immense need for modern enterprise software solutions, he dedicated his career to building and refining platforms that could help large companies manage finance, HR, and payroll. His enduring success is built on his ability to identify and solve structural inefficiencies in the corporate back office.

David Duffield's career is marked by two massive software revolutions. 1987: PeopleSoft. He founded PeopleSoft, which quickly became a dominant provider of client-server human resources (HR) and financial management software, achieving massive growth and a high-profile presence in the enterprise market.

2004: The Oracle Battle. The latter part of his time at PeopleSoft was dominated by an 18-month-long hostile takeover battle with Oracle Corporation, led by Larry Ellison. Duffield returned as CEO during the struggle but resigned in 2004 after the board agreed to sell the company to Oracle for $10.3 billion. 2006: Workday. Undeterred, Duffield immediately founded his newest company, Workday, recognizing that the future of enterprise software was cloud-based (on-demand). Workday pioneered cloud ERP for HR and finance, competing directly with his former rival, Oracle. Workday's phenomenal success (NYSE: WDAY) secured his multi-billion dollar fortune, cementing his legacy as one of the most successful serial entrepreneurs in the history of enterprise software.

David Duffield is a major philanthropist, focusing his giving on animal welfare, education, and human services. He and his wife co-founded the Maddie's Fund (named after their miniature schnauzer), a massive foundation dedicated to revolutionizing the status and welfare of companion animals.

His structural social impact is the creation of the modern HR and financial management software industry, driving efficiency for millions of employees globally. His commitment to creating a superior product for his customers, even launching a new company to compete against his former one, is a testament to his values-driven leadership.

David Duffield maintains the professional, high-IQ style of a serial software founder. His attire is consistently practical and high-quality, favoring tailored shirts and jackets. His aesthetic is one of confident authority and technical focus.

His luxury is the immense security and financial reward derived from his multi-billion dollar fortune, which he leverages to pursue high-impact philanthropic missions (animal welfare) and technological innovation. His life is defined by his relentless pursuit of the next major enterprise software revolution.