1882 – Born on the 23rd of September in Modesto, California, Unites States.
1908 – He obtained his medical degree from Johns Hopkins University, Baltimore, Maryland, United States.
1915 – He moved back to to California and was made professor of anatomy at the University of California,
in Berkeley, California, U.S.A.
1918 – His research into the number of human chromosomes led him to believe that there are 48 chromosomes.
1923 – He co-discovered Vitamin E which is needed for human reproduction.
1931 – He became a director of the Institute of Experimental Biology in Berkeley, California, United States.
1971 – He died on the 6th of March in Berkeley, California.