Jaan Tallinn (born 14 February 1972) is an Estonian billionaire computer programmer and investor[2][3] known for his participation in the development of Skype and file-sharing application FastTrack/Kazaa.

He was a Series A investor and board member at DeepMind (later acquired by Google) alongside Elon Musk, Peter Thiel and other early supporters.

[9][10][11][12] Tallinn graduated from the University of Tartu in Estonia in 1996 with a BSc in theoretical physics with a thesis that considered travelling interstellar distances using warps in spacetime.

Subsequently, while working as a stay-at-home father, Tallinn developed FastTrack and Kazaa for Niklas Zennström and Janus Friis (formerly of Tele2).

[25] His main worries are related to artificial intelligence, unknowns coming from technological development, synthetic biology and nanotechnology.

Tallinn recalls that "the overall idea that caught my attention that I never had thought about was that we are seeing the end of an era during which the human brain has been the main shaper of the future".

Tallinn praised Anthropic for having a greater safety focus than other AI companies, but said "that doesn’t change the fact that they’re dealing with dangerous stuff and I’m not sure if they should be.