Takeo Fujii received B.E., M.E., and Ph.D. degrees in electrical engineering from Keio University, Yokohama, Japan, in 1997, 1999, and 2002, respectively. From 2000 to 2002, he was a research associate in the Department of Information and Computer Science, Keio University. From 2002 to 2006, he was an assistant professor in the Department of Electrical and Electronic Engineering, Tokyo University of Agriculture and Technology. From 2006 to 2014, he was an associate professor in the Advanced Wireless Communication Research Center, the University of Electro-Communications. Currently, he is a professor and a director of the Advanced Wireless and Communication Research Center, The University of Electro-Communications. His current research interests are in cognitive radio and ad hoc wireless networks. He received the Best Paper Award in IEEE VTC 1999-Fall, the 2001 Active Research Award in Radio Communication Systems from the IEICE technical committee of RCS, the 2001 Ericsson Young Scientist Award, the Young Researcher's Award from the IEICE in 2004, the Young Researcher Study Encouragement Award from the IEICE technical committee of AN in 2009, the Best Paper Award in IEEE CCNC 2013, and the IEICE Communication Society Best Paper Award in 2016. He is a member of IEEE.