Mark's next move was to I.G. Farben, where he established a polymer laboratory. That was also where he first collaborated with Kurt Meyer, with whom he published the pioneering x­-ray crystallographic structure of cellulose. Mark describes the laboratories, research directions, and colleagues during his stay at Ludwigshafen. The worsening political climate in Germany prompted Mark to accept a chair at his alma mater. Back in Vienna, he set up the first comprehensive polymer research and teaching institute. Mark concludes this interview by describing the circumstances of an approach from the Canadian International paper Company and his decision to leave Austria.

The second interview details his experiences in the Canadian paper industry and his early ventures into publishing with the first of the Polymer Monograph series. Mark explains how he was able to resume an academic career by starting the polymer program at Brooklyn Polytechnic Institute, which soon became world-renowned. The war-­time years brought new projects and young faculty to Brooklyn. Mark briefly describes this period before going on to the immediate post-­war era and the later expansion of the Polymer Research Institute, which forms the introductory section of the final interview. In this interview, Mark tells of his part in the formation of the literature of polymer science and technology: journals, monographs, reference books and encyclopedias. Mark's many international collaborations are outlined, spanning a pre­-war expedition to a Caucasian glacier to a demonstration of the nylon rope trick to Emperor Hirohito. Finally, Mark refers to his more recent research interests and describes the changes in research funding that have taken place during the past four decades.