Answer by taking a quote from the following article:

Rudolph Van Gelder (November 2, 1924 - August 25, 2016) was an American recording engineer who specialized in jazz. Regarded as the most important recording engineer of jazz by some observers, Van Gelder recorded several thousand jazz sessions, including many recognized as classics, in a career which spanned more than half a century. Van Gelder recorded many of the great names in the genre, including John Coltrane, Miles Davis, Thelonious Monk, Sonny Rollins, Art Blakey, Joe Henderson, Freddie Hubbard, Wayne Shorter, and Horace Silver, among many others. He worked with many record companies but was most closely associated with Blue Note Records.

In 1967, Alfred Lion retired from running Blue Note, and the company's owners, Liberty Records (from 1965), began to use other engineers more regularly. Prestige, too, had started to use other studios a few years earlier. Van Gelder remained active in music recording, working as the engineer for most of Creed Taylor's CTI Records releases, a series of proto-smooth jazz albums that were financially successful, but not always well received by critics.  Though his output slowed, Van Gelder remained active as a recording engineer into the new century. In the late 1990s he worked as a recording engineer for some of the songs featured on the soundtrack to the TV Show Cowboy Bebop. From 1999, he remastered the analog Blue Note recordings he made several decades earlier into 24-bit digital recordings in its RVG Edition series and also a similar series of remasters of some of the Prestige albums he recorded for its current owners, Concord Records. He was positive about the switch from analog to digital technology. He told Audio magazine in 1995:  The biggest distorter is the LP itself. I've made thousands of LP masters. I used to make 17 a day, with two lathes going simultaneously, and I'm glad to see the LP go. As far as I'm concerned, good riddance. It was a constant battle to try to make that music sound the way it should. It was never any good. And if people don't like what they hear in digital, they should blame the engineer who did it. Blame the mastering house. Blame the mixing engineer. That's why some digital recordings sound terrible, and I'm not denying that they do, but don't blame the medium.  Van Gelder resided in Englewood Cliffs into this century. He died at his Engelwood Cliffs home on August 25, 2016.

What other groups and artists did he work with in the 1990s?
Van Gelder remained active in music recording, working as the engineer for most of Creed Taylor's CTI Records releases,