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Toshiyuki Yamamoto
Toshiyuki Yamamoto
CEO, Chatwork
About author
Toshi Yamamoto is an entrepreneur based in Silicon Valley as CEO of ChatWork Japan and US.

In 2000, Toshi bootstrapped a business of web marketing and software sales, and made it profitable for the past 12 years.

In 2012, Toshi decided to drive all the resources to focus on its own service, ChatWork, set up a US office and moved to Silicon Valley. Toshi changed the company name from EC studio to ChatWork at that time.

Toshi has also written three books that have been ranked as #1 of all books on

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