Bluetooth was invented by  Jaap Haartsen and Sven Mattisson in 1990 while they were working for  Ericsson Mobile  research and development in Lund, Sweden.While the duo were  working at Ericsson,they were tasked  to develop wireless headsets.it was originally conceived as a wireless alternative to RS-232 data cables.

Brief Profile about the inventors

Dr Jaap Haartsen
 
Obtained his master of science degree in 1986 in electrical engineering (with honors) at the Delft University of Technology. After a brief period at Siemens in The Hague and Philips in Eindhoven, he continued his studies and in 1990 obtained a PhD degree from the Delft University of Technology (also with honors) defending the thesis titled Programmable surface acoustic wave detection in silicon: design of programmable filters. Since 1991 he worked for Ericsson, first in United States between 1991 and 1993 and later, between 1993 and 1997, in Sweden. While working for Ericsson Mobile Terminal Division in Lund, he developed Bluetooth specification.