Richard Stallman - 30 years ahead of time for free-software, privacy and licenses.

Yann LeCun and Geoffrey Hinton - 20 to 30 years ahead of their time for research on AI, neural networks, convolutional neural networks and their many applications to them.

Theo de Raadt - 20 years ahead of time for security-focused operating system OpenBSD and its software projects.

Perhaps the person we all would have liked to have known who was indeed ahead of their time is Satoshi Nakamoto.