Alex Rosner is an American sound engineer and designer.[1] He is known as the sound designer for the club The Loft and as the inventor of the DJ mixer.[2]
Rosner and his father survived the Holocaust and time at Dachau. After the war the family moved to Queens, New York. He received a degree in engineering from Rensselaer Polytechnic Institute.
Rosner got started building Hi-Fi systems while a student in electrical engineering.[3] He built stereophonic discotheques at the 1964-65 World's Fair. This was the world's first stereophonic system.[4]
Rosner opened his business, Rosner Custom Audio, in 1967. He had a long collaboration with David Mancuso. Rosner prototyped the first mixer in 1965, as a way to transition between vinyl records.[5] He designed systems for Directoire, the Ginza, the Limelight, Max's Kansas City, Shepheard's, Tambuorine, and Tamburlaine. Rosner's systems survive at Riverside Cathedral and St. John the Divine churches in New York.