1928
Born to Reuben and Elanor Regina (Mead) Barker in Seekonk, MA.
1950
Earns a Bachelor of Science from Massachusetts Institute of Technology.
1952
Earns a Master of Science from California Institute of Technology.
1954
Earns a Doctor of Philosophy from California Institute of Technology.
1955
Is a research geologist for the U.S. Geological Survey in Juneau, AK.
1957
Completes year-long postdoctoral studies at Harvard University.
1957
Is a research geologist for the U.S. Geological Survey in Washington, D.C., until 1962.
1959
Is a research geologist for the U.S. Geological Survey in Menlo Park, CA.
1962
Is a research geologist for the U.S. Geological Survey in Denver, CO, until 1993.
1972
Is a research grantee for the National Geological Society in Swaziland.
1973
Writes a paper on Early Precambrian rocks of Swaziland.
1974
Is a visiting fellow at the University of Witwatersrand in Johannesburg, South Africa.
1974
Is a fellow and editorial advisor of the Geological Society of America until 1978.
1974
Is an editorial advisor for Elsevier Pub. Co. in Amsterdam, the Netherlands, until 1993.
1978
Completes three-year study of Archean (3.7-3.8 by age) rocks of Big Horn Mountains, WY.
1979
Writes Trondhjemites, Dacites, and Related Rocks (a contributed volume).
1993
Retires from his profession and is named a geologist emeritus by the U.S. Geological Survey in Denver, CO.
2019
Divides Earth’s granitic rocks into three families: Archean trondhjemites; Granite melted from graywacke; and Bi-melt Granite.