He was the president, from 2004,[1] and CEO, from 2006, of Diamond Management & Technology Consultants (DMTC)[2] until its takeover by PWC.
He has been a director of the company since 1999, and has held senior positions including that of chief operating officer.
[citation needed] He is also a director of Healthaxis, Inc.[citation needed] DMTC was taken over by PwC for $378m,[3] Gustein transitioned to PwC, continuing to lead the team.
[4] Gutstein was listed as one of the industry's "top 25 most influential consultants"[1] and Diamond was subject of a monograph in the 25 Top Consulting Firms Insider Guide series.
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