In 1997 Mr Grela graduated from the Faculty of Civil Engineering of the Silesian University of Technology in Gliwice. In the same year, he started working for Dombud S.A. in Katowice, a construction company, where he worked until 2001 as a marketing department manager. For the next two years he was a logistics manager and a trade director in Farmacol S.A. in Katowice. Between November 2002 and July 2006 he worked as a chief operations officer and next was appointed as a member of the management board in Metalplast Bielsko S.A. Simultaneously, from 2004 Mr Grela was the President of the Management Board of Metalplast-Stolarka Sp. z o.o. that he held until December 2008.
Since December 2008 Mr Grela has been the President of the Management Board of Aluprof S.A.