Hans Mueller was a blonde-haired Human man who lived in the 23rd century. In the 2260s, he was a technician in Starfleet, serving as an engineer. In 2268, while serving on the Federation starship USS Enterprise, he developed a strong dislike for Vulcans and joined Theodore Lowrey's anti-Vulcan group. (TOS novel: Vulcan!)

USS Enterprise (NCC-1701) engineering personnel
under Rasmussen & April	Brownell • Chang • Cho • Fourrier • Graff • Hart • Kursley • Marvick • McCormick • Number One • Powell • Roberts • Saffire • Thompson • Thorvaldsen • Wood	under Pike	Abdelnaby • Ars Dan • Barry • Brien • Hazarstennaj • Grace • Burnstein • Pitcairn • Samson • Scott • Spahn • van Hansen • Wright • Yamata
under Kirk (1st 5-year mission)	Andres • Antonoff • Aziz • Barnhart • Bates • Becker • Berkeley • Bregman • Burdock • Campeas • Celaux • Chatusram • Cho • Colfax • Cortez • Crider • Critelli • Dastagir • Davis • DeLong • deRoos • DeSalle • Devlin • Dixon • Douglas • Dubois • Duchamps • Edwards • Frost • Harper • Harrison • Gabler • Galaym • Galloway • Gardner • Gordon • Grant • Green • Hart • Hazarstennaj • Holgersson • Jacobs • James • Jenkins • Kaplan • Kopka • Krensky • Kyle • Lanz • Lefebre • Lemli • Leslie • Lewis • Loupas • Lyles • MacPherson • Masters • Markham • Matt • McConel • McDuff • McPhee • M'degu • Mikhalis • Miller • Mueller • Nagata • Nason • Oba • O'Neil • Orsay • Renner • Riley • Riviera • Rogers • Rostofski • Russ • Satterfield • Scott • Senif • Sepopoa • Shallert • Shigeda • Singh • Stanley • Stryker • Sulernova • Tam • Tenney • Tersarkisov • Thomas • Washburn • Watkins • Watson • Whitehead • B. Wilson • Wilson • Winfield • Wyatt • Zellich
subsequent missions under Kirk & Spock	Athendë • Bradley • Cleary • Dettner • R. Grenni • Lasja Ihirian • Jacobs • Kasatsuki • Kugel • Layne • Lydia • Peter Preston • Quarton • R'trikahi • Janice Rand • Teresa Ross • Schneider • Montgomery Scott • Two Feathers • Washburn • Weinberger • Cyron Williams
see also: administrative personnel • communications personnel • medical personnel • pilots & flight control personnel • security & tactical personnel • sciences personnel • senior staff • unnamed