Reference

William Walden Rubey held several positions with the National Academy of Sciences:

1. He was a member of the United States National Academy of Sciences starting from 1945, as indicated by his Wikipedia page William Walden Rubey - Wikipedia.

2. Rubey served as the Chairman of the Division of Geology and Geophysics within the National Academy of Sciences, as mentioned in the Geological Society of America's memorial Memorial to William Walden Rubey - Geological Society of America.

3. He was also the Chairman of the National Research Council for the National Academy of Sciences from 1951 to 1954, as stated in the article The Academy in the Fifties — Beginnings of the Space Age - NCBI.

These positions highlight Rubey's significant contributions and leadership within the National Academy of Sciences.