David Harel (born in Boston USA 1953) grew up in Israel and served in the I.D.F as a fighter pilot until 1982. Graduated Harvard Business school MBA 1984 and worked as an investment manager in New York until 1990. He joined his father in starting a family collection of Russian Avant-grade paintings, including masterpieces by Kandinsky, Malevich and Popova. This led to ten years of intensive archival research of Russian and Ukrainian art which focused on Malevich lost paintings. The book, "Malevich: The Lost Paintings" is a culmination of this research project.

Joseph Agassi (born in Jerusalem on May 7, 1927) is an Israeli academic with contributions in logic, scientific method, and philosophy. He studied under Karl Popper and taught at the London School of Economics. He later taught at the University of Hong Kong, the University of Illinois, Boston University, and York University in Canada. He had dual appointments in the last positions with Tel Aviv University.

​https://en.wikipedia.org/wiki/Joseph_Agassi

https://www.malevich-lostpaintings.com/the-book