The Programme Committee of TACL2015, together with the TACL Steering Committee, have decided to honour the memory of Grigori Mints and Franco Montagna, two respected and beloved logicians who recently passed away. The conference’s programme therefore includes two special in memoriam sessions. Each session consists of four contributed talks that relate in various manners to the work of Franco and Grigori. The sessions are scheduled as plenary. Please note that the coffee breaks preceding these two sessions end 10 minutes earlier than usual, in order to give the chairpersons the possibility of opening the sessions appropriately.