He acquired his master's degree in architecture and planning at Tokyo National University of Fine Arts and Music in 2000. Ishigami worked with Kazuyo Sejima from 2000 to 2004 at SANAA, before establishing his own firm in 2004: junya.ishigami+associates. Ishigami showed solo in the Japanese pavilion at the 11th Venice Architecture Biennale in 2008; and was the youngest ever recipient of the Architectural Institute of Japan Prize for the Kanagawa Institute of Technology KAIT Workshop in 2009. In 2010 he won the Golden Lion for Best Project at the 12th Venice Architecture Biennale, and in the same year he became an Associate Professor at Tohoku University in Japan. In 2014 he was made the Kenzo Tange Design Critic at the Harvard Graduate School of Design in the US.