I currently work for Opscode who sponsor the Chef open-source project and supply commercial configuration management products.

I worked for Opsware Inc. a pioneer in the field of Data Centre Automation from May 2004 to July 2009. Including a short stay at HP who acquired Opsware in October 2007

Other previous employment (not chronologically ordered):

Aster Data: Now part of Teradata Corp.

Netuitive Inc. A Reston-based supplier of IT operational analytics software

VCE (the Virtual Computing Environment Company) formerly known as Acadia

Perot Systems Corp. Now part of Dell Services

Radan Computational: Now part of Planit

Digital Equipment Corporation (DEC): Now part of HP via Compaq