In memory of Professor David Alexander YuenOA

David Alexander Yuen was born on June 14,1948,in Shanghai during the Chinese Civil War.His family moved to Hong Kong the following year.Thanks to the help of Senator Mike Mansfield,a Democrat from Montana,who met Dave''s father during World War II,the entire family of seven moved to New York City in 1956.Dave showed much enthusiasm as a student,graduating from Xavier High School in Lower Manhattan in 1965,along with other successful Americans such as Supreme Court Justice Antonin Scalia.Dave proceeded to Caltech to study chemical physics and then moved to the chemistry department at the University of California,Berkeley in 1969,where the beginning of the plate tectonics revolution inspired him to change his focus to geophysics.