He replaces David Wilton, who joined WYG in February 2009 and has decided to leave after completing the financial restructuring of the group in July.
Mr Cummins, 49, was the finance director of Rok who swiftly made the call to bring in administrators a year ago. He joined Rok on 1 October 2010. On 8 November, it went into administration.
Before that he was group finance director of Scott Wilson from September 2007 until its acquisition by URS Corporation in September 2010. And before that, Mr Cummins was finance director of chemicals group Yule Catto & Co for seven years.
WYG chairman Mike McTighe said: "We are delighted to welcome someone of Sean's calibre to the board. He has extensive relevant public company experience and has deep knowledge of the global consultancy sector through his time at Scott Wilson. Following the capital restructuring completed in July, WYG has entered a new growth phase in its development and Sean is ideally equipped to help lead WYG in the execution of its recently articulated international strategy.”
WYG also today announced its interim results for the six months to 30 September 2011. It made an operating loss of £2.5m on revenue down 18% to £68.5m. However, after the refinancing, it has £24m net cash in the bank, instead of the £38.5m net debt that it had this time last year.