Mathematicians and Computer Scientists know that the Donald that has had real impact in our world is Donald Knuth, not Mr. Trump. He is a giant in the industry and very well respected.
He’s also tireless and persistent. Consider this, he has been working on his seminal work, The Art of Computer Programming for 43 years and he figures he has 20 more years of work left. Volume 2 of the work, Seminumerical Algorithms, formed much of the backbone for my college thesis on pseudorandom number generation.