Hiroki Ikegami is a senior research scientist at RIKEN. He received a B. S., M. S., and Ph. D. from the University of Tokyo, all in applied physics. He was an Assistant Professor at Graduate School of Arts and Sciences, the University of Tokyo in 1999–2001 and a research scientist at RIKEN in 2001–2007. Since 2007, he has been a senior research scientist at RIKEN. His research is focused on experimental studies of condensed matter physics at ultralow temperatures, particularly on topological aspects of the superfluid 3He, 3He and 4He confined in low dimensional systems, and electrons trapped on a helium surface. He is also working on quantum many-body physics realized insuperconducting quantum circuits. He received a Young Scientist Award of the Physical Society of Japan in 2009 and JSPS (Japan Society for the Promotion of Science) Prize in 2015.