1902 – Born on the 28th of December in New York City.
1930 – He was appointed to the philosophy faculty at the University of Chicago.
1949 – He served on the Board of Editors of Encyclopaedia Britannica.
1952 – He founded and served as director of the Institute for Philosophical Research.
1965 – He was the director of editorial planning for the fifteenth edition of Britannica.
1980 – He wrote "How to Think About God".
1981 – He conducted a seminar in Colorado at the Aspen Institute based on his book "Six Great Ideas".
2000 – He became a Roman Catholic.
– He can be considered a Catholic philosopher due to his lifelong participation in the Neo-Thomist movement.
2001 – He died on the 28th of June.