DJB might be more of an privacy/infosec/Unix thing, so if you're a different type of programmer then fair enough.

He is famous in crypto (as in cryptography) circles for:

- Ed25519 for fast + safe asymmetric crypto

- chacha/poly for fast symmetric crypto

He is also famous in Unix circles for:

- qmail

- djbdns

- his init system daemontools

and a bunch of other bits.

He also fought the US government for your right to use encryption when encryption was considered a munition.

More at https://en.wikipedia.org/wiki/Daniel_J._Bernstein or https://cr.yp.to

Jensen is NVIDIA. Left MSI, took on the #1 competitor in the space (3DFX) and dominated them, responsible for things like CUDA and DLSS, now supplies the hardware for most of high end gaming and ML, has a two year advantage over AMD, appeared in his kitchen for an announcement once then a few months later told everyone that the entire scene was done with high quality physics based rendering and nobody knew.