Here is his Prem experience:
"He has also managed Preston North End, who he took to the Championship Play-offs in 2009, and Sheffield Wednesday in the Championship and League One."
What's that? Oh yes, he hasn't got any! His best "achievement" has been to get Preston into the Championship play-offs! From Wikipedia:
"Irvine was appointed manager of Sheffield Wednesday on 8 January 2010. Wednesday got off to a good start under Irvine, winning games against Barnsley, Blackpool and Peterborough United. Irvine was named Championship Manager of the month for January 2010. This form was not sustained, however, as on the last day of the season Wednesday needed a home win against Crystal Palace to avoid relegation. The match ended in a 2–2 draw, relegating Wednesday to League One.
Wednesday then had severe financial issues, with the club appearing in court twice over winding up orders. Following the successful takeover by Milan Mandaric at the end of 2010, Irvine was allowed transfer funds to revamp his squad. Despite making several new signings, the team continued to have consistently poor results. On 3 February 2011, Wednesday sacked Irvine with the side lying 12th in League One."
Well, Mr Peace, please do tell us exactly what it is that you've learned? We're dying to know!