When it comes to recorded jazz, these two engineers are in my opinion, the "COUP DE GRACE". However, when it comes to notoriety, I would bet the bank that Rudy Van Gelder would win this category hands down. In a career spanning more than half a century,Van Gelder has recorded many of the great names in the genre, including Miles Davis, Thelonious Monk, Sonny Rollins, Joe Henderson, Grant Green, Wayne Shorter, John Coltrane, and many others. He worked with many record companies, but he is most closely associated withBlue Note Records, now a division of EMI. The signature of a Van Gelder recording lies in the rich, natural tone of each instrument and the clearly defined separation between them, ensuring that every sonic detail is audible.  This was accomplished by the strategic placement of instruments in the studio, though his exact technique has always been a closely guarded secret. Van Gelder's main goal was to create the best mood for the musicians to perform in, and from the results, he seems to have greatly succeeded. Among the timeless recordings made under his aegis are John Coltrane's Blue Train (Blue Note) Miles Davis' Workin' (Prestige), Andrew Hill's Point of Departure (Blue Note), Freddie Hubbard's Red Clay(CTI), Wayne Shorter's Speak No Evil (Blue Note), and Gene Ammons' Boss Tenor (Prestige) to name just a few. There is a excellent interview with RVG here: http://jazzprofiles.blogspot.com/2011/05/rudy-van-gelder-signature-sound.html.