Author of the D21 voting system - the Janecek method. Graduated from Bradley University in the USA (MBA) and the Faculty of Mathematics and Physics of Charles University in Prague. In 2004 he received his Ph.D. in mathematical finance from Carnegie-Mellon University in Pittsburgh. He was a lecturer in stochastic analysis at MFF UK, and professionally he was involved in trading financial derivatives. He has established six foundations through which he supports projects that focus on children's education, science, active civil society, culture, anti-corruption activities, helping the needy, sports and socially beneficial innovations.

Karel Janeček was a presidential candidate in the 2023 elections. His bio is presented here unedited.