He retired from his teaching position but he still research math and present his findings on his channel.

you can find a walkthrough of his article here

Paper with Dean Rubine on Solving Polynomial Equations and the Geode (I) | N J Wildberger https://youtu.be/oIHd3zDDDCE?si=kdJnuRB1GYi_mg-5

Subdigons and Solving Polynomial Equations and the Geode (with Dean Rubine) II | N J Wildberger https://youtu.be/Jl0TWMN85G0?si=1IzlrHBBT009lLKq

The History behind Hyper-Catalan Series Solutions to Polynomial Equations -- with Dean Rubine https://youtu.be/nvH09WvvERY?si=Df4F9XeD5Yhgw0Xh