Dutch astronomer and marxist theorist. He was one of the main theorists of council communism. As a recognized Marxist theorist, Pannekoek was one of the founders of the council communist tendency and a main figure in the radical left in the Netherlands and Germany. In his scientific work, Pannekoek started studying the distribution of stars through the Milky Way, as well as the structure of our galaxy. Later he became interested in the nature and evolution of stars. Because of these studies, he is considered to be the founder of astrophysics as a separate discipline in the Netherlands. The Astronomical Institute Anton Pannekoek at the University of Amsterdam, of which he had been a director, still carries his name.

Paul Mattick, Sr. (March 13, 1904 – February 7, 1981) was a Marxist political writer and social revolutionary, whose thought can be placed within the council communist and left communist traditions. Father of author Paul Mattick Jr..