Arthur Keller

Arthur Keller is a five-time founder with two successful exits. He has built his entire career outside traditional corporate structures, founding and leading his own companies and turning contrarian thinking into a competitive edge across fintech, AI, creative production and global commerce.

Arthur’s entrepreneurial path includes founding and exiting a high-end production company, as well as founding and selling a premium tequila brand after prevailing in a complex U.S. federal court case. Today, as Founder & CEO of London-based Ross & Andersen LLP, he delivers global financial solutions to independent professionals and small businesses. Ross & Andersen LLP is an approved vendor to Amazon, LVMH, Sony, L’Oréal, Live Nation and Dassault Aviation, among many others. Arthur also helped drive the early adoption of local AI at Euclid, a Swiss commodity trading and risk management software company. He helped secure funding from former Trafigura executives and led the implementation of privacy-first AI systems in one of the most data-sensitive industries. He now serves on the board of Euclid SA.

A former top-50 Olympic-class sailor, Arthur brings elite discipline and execution focus to every venture. He pairs that discipline with a creative vision shaped by a decade in New York City’s fashion industry, where he worked with leading fashion brands. Today, those experiences converge in Monark, which Arthur is building to advance human sovereignty. Anchored in America, Monark rests on a clear conviction: progress must expand human agency, protect privacy, preserve choice and give people greater freedom to shape their own lives.