Nag's work has focused on inventing new systems for interacting with mobile devices, resulting in breakthroughs in the application of
speech recognition,
handwriting recognition,
predictive text and
touch screens for mobile devices. As a student at Cambridge University, Nag wrote an article applying a
hidden Markov model to speech recognition, which became the basis for his Phd on the subject. In 1991 Ronjon Nag began researching artificial neural networks, first under
Amar Gupta at MIT and then in Stanford University's Department of Psychology, studying under
David Rumelhart. As CEO and as a computer scientist, Nag oversaw the emergence of Lexicus as an industry pioneer of speech and predictive technology systems and saw the acquisition of Lexicus by Motorola in November 1993. As a subsidiary of Motorola, Lexicus introduced some of the first devices with Chinese handwriting and speech recognition. In 1999, he founded Cellmania, a mobile infrastructure company that provided digital rights management for mobile content, enabling the creation of some of the first mobile app stores. Cellmania was sold to Research in Motion, now
BlackBerry Limited, in 2010 for an undisclosed sum. winning the $1m Verizon Powerful Answers Prize in 2015. ==Awards==