text: NTA and related technologies were developed by Bob Carr. Along with John Knowles, Carr founded NanoSight Ltd in 2003. This United Kingdom-based company, of which Knowles is the chairman and Carr is the chief technology officer, manufactures instruments that use NTA to detect and analyze small particles in industrial and academic laboratories.  In 2004 Particle Metrix GmbH was founded in Germany by Hanno Wachernig.  Particle Metrix makes the ZetaView which operates on the same NTA principle but uses different optics and fluidics in an attempt to improve sampling, zeta potential, and fluorescence detection.