As part of BoomTown’s duty as internal jobs board for Yahoo, here’s another departure: CIO Michael Kirwan.

A terse email went out yesterday about Kirwan’s leaving.

According to his Yahoo bio, he had “global responsibility for Yahoo!’s Corporate Systems group, which includes the IT Infrastructure, Corporate Applications, CRM and Premium Services Infrastructure teams. These teams ensure Yahoo!’s internal systems and billing/anti-fraud services are available 24/7.”

In other words, the guy who keeps the lights on!

Kirwan reported to David Dibble, EVP of Service Engineering & Operations at Yahoo.

Kirwan previously worked at VeriSign, as well as at Bank of America, Bank of California, and Union Bank of California.

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