Kei Asatsuma is a partner at Nagashima Ohno & Tsunematsu. His practice focuses on complex business transactions, including M&A, divestitures, spin-offs, joint ventures, strategic alliances, leveraged buyouts, private equity investing, restructuring and workouts, and recapitalisations. He also counsels clients in a wide variety of corporate matters, including corporate governance issues, and is often called upon to represent public companies involved in takeover and active shareholder defence.

He graduated with an LLB from the University of Tokyo in 1995 and with an LLM from the University of Chicago in 2002. He was admitted to practise law in Japan in 1997, and worked at Kirkland & Ellis LLP in Chicago from 2002 to 2003, where he focused on international litigation and cross-border transactions involving Japanese companies, and general corporate matters for US and Japanese companies.