), and served as a program committee member and chairman of the main international conferences OOPSLA and ECOOP.

[9] Yonezawa's concurrent (parallel) objects are influenced by Actors, the concept of which was proposed by Carl Hewitt at MIT's AI Lab in the early 1970s[10] and later rigorously formulated by Gul Agha.

His dissertation is entitled "Specification and verification techniques for parallel programs based on message passing semantics".

[1][2][20][21] After retiring from the University of Tokyo, he served as deputy director of the RIKEN Computational Science Institute until 2015, contributing to the operation of the supercomputer "K".

[26] From April 2001 to March 2004, he was a member of the Cabinet Office Regulatory Reform Council[27] and the chief of the Education and Research Working Group.

[28] He concurrently served as Auditor of the National Institute of Information and Systems,[29] Director of Database Center for Life Science,[30] and deputy director of the Information Security Research Center in the National Institute of Advanced Industrial Science and Technology(AIST).

[26] Furthermore, since 2006, he has served as a member of the TCAAB (Trustworthy Computing Academic Advisory Board) at Microsoft headquarters (Redmond, Washington).

[38] In 2008, he received the Dahl-Nygaard Prize from the Association Internationale pour les Technologies Objets (AITO) as a proponent of the concept of "concurrent/parallel objects" and for his long-standing research results ranging from theory to practice.