Who co-founded Roblox alongside David Baszucki?

David Baszucki co-founded Roblox alongside Erik Cassel. The pair established Roblox Corporation in 2004 and began developing the platform that would become Roblox.

Baszucki and Cassel had already worked together at Knowledge Revolution, an educational-software company known for Interactive Physics and Working Model. Their earlier experience with physics simulations helped shape Roblox’s building-focused, user-generated design.

The project went through early working names, including eBlocks, GoBlocks, and DynaBlocks, before becoming Roblox. The platform was officially released to the public on September 1, 2006. Baszucki became the company’s public-facing leader and remains closely associated with the Builderman username.

Cassel served as a key technical leader and co-founder until his death from cancer on February 11, 2013. A common mix-up is confusing Roblox’s founders with later executives or developers; Chris DeWolfe, Alex Waislitz, and John Shedletsky were not Baszucki’s co-founder.