Professor "Nonlinear": Obituary and memoir for Roman Juszkiewicz (1952-2012)

On 28th and 29th of January 2013 we held an international meeting in Zielona G\'ora (Poland) honouring the first anniversary of premature passing away^(1) of Professor Roman Juszkiewicz. We have celebrated an opening of a new seminar room at the University of Zielona G\'ora commemorated to the memory of Roman Juszkiewicz and we have shared our anecdotes and memories of this great scientist and friend. Here we want to present a limited and short memoir and obituary for Roman Juszkiewicz. 1: Roman Juszkiewicz passed away on 28th of January 2012