Hechtkopf illustrated hundreds of books in his career. Hechtkopf worked with top Israeli publishers, including Masada, Yavneh, Zimzun, Machanayim and Ofer. In addition, he served as the senior illustrator at Am Oved publishing house. In the United States, he worked with Lerner Publications, Minneapolis, and Dodd, Mead & Co., New York. Amongst the books that Hechtkopf illustrated:
Hechtkopf participated in dozens of group exhibitions in Israel and abroad. His work is exhibited at the museum in Berkeley, CA, in the Jewish museum in Warsaw and in the Yad Vashem Holocaust Memorial in Jerusalem. In addition, his works were included exhibitions in Warsaw between 1932-39. In addition, from 1947-1957 he exhibited in Lodz, Wroclaw, Krakow, Katovice. Some of the group exhibitions: