Oh no... I used his work on nearest positive semidefinite matrices and liked to read his blog. In my opinion, he was very good in explaining his research.
In my case, I am applying this in the calibration of instantaneous correlation matrices. His relevant papers can be found at [0].
It was really helpful that he also published MATLAB code of most of his algorithms.
[1] https://nhigham.com/2021/01/26/what-is-the-nearest-positive-...