In 1997 Mr Grela graduated from the Faculty of Civil Engineering at the Silesian University of Technology in Gliwice. In the same year, he started working for Dombud SA 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 SA in Katowice. Between November 2002 and July 2006 he worked as a Chief Operations Officer and then he was appointed to the position of a Management Board member at Metalplast Bielsko SA 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 SA