He is using Smalltalk from 1986.
His first experience of Smalltalk was Digitalk Methods.
He uses Smalltalk/V, Apple Smalltalk-80, Xerox Smalltalk-80, ParcPlace ObjectWorks, VisualWorks, and Squeak.
He participated in many Smalltalk projects that includes 3D Grphics Library. CASE Tool, Japanese Localization, CRM System, Foreign Exchange Dealing System, Semiconductor CMP System, etc.