From 1993 to 1996 he was with Dantec Measurement Technology A/S, Copenhagen, Denmark, from 1996 to 1998 he was an assistant professor at Gwangju Institute of Science and Technology (GIST), Gwangju, Korea, and from 1998 to 2000 an assistant professor at Department of Electrical and Computer Engineering, University of Calgary, Calgary, AB, Canada, and a staff scientist at TRLabs, Calgary. Since 2001 he has been with the Department of Electrical Engineering, University of Hawaii at Manoa,Honolulu, since 2009 as professor. He was a visiting professor at Seoul National University in 2017 and at Shenzhen Research Institute of Big Data (SRIBD) in 2018 and 2019. He was a founder and CTO (2007-2008) of Kai Medical, Inc., which is making equipment for non-contact heart monitoring. His research interests are in statistical signal processing, data science, information theory, and wireless communications, including ad-hoc networks, cooperative diversity, wireless sensor networks, heart monitoring, marine mammal signal processing, big data, and learning theory.