Ph. D, (Chemistry) University of North Carolina (Chapel Hill) circa 1942. While working for US Naval Research (Washington, DC) Shell Development Company (Amsterdam, The Netherlands) and the University of California (Berkeley) he used his considerable talents toward developing early versions of what would become known as the internet. (He is also frequently credited with being a co-inventor of the modern mass spectrometer.)
Sources
1) Personal knowledge
2) "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M843-5FQ : accessed 15 September 2015), David L Cook in household of Lewis T Cook, St Joseph Ward 6, Buchanan, Missouri, United States; citing sheet 1A, family 1, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,908.
2) "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VRLM-Z64 : accessed 10 August 2015), David L Cook in household of Lewis T Cook, Ward 6, Wichita, Wichita City, Sedgwick, Kansas, United States; citing enumeration district (ED) 107-108A, sheet 8B, family 233, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1275.
3) United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J5FQ-7Q9 : accessed 15 September 2015), David L Cook, 13 May 2004; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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DNA Connections
It may be possible to confirm family relationships with David by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with David:
*"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M843-5FQ : accessed 28 July 2015), David L Cook in household of Lewis T Cook, St Joseph Ward 6, Buchanan, Missouri, United States; citing sheet 1A, family 1, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,908.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7QD-4X4 : accessed 28 July 2015), David L Cook in household of Lewis T Cook, Parsons, Labette, Kansas, United States; citing enumeration district (ED) 0023, sheet 3B, family 77, line 69, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 707; FHL microfilm 2,340,442.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VRLM-Z64 : accessed 28 July 2015), David L Cook in household of Lewis T Cook, Ward 6, Wichita, Wichita City, Sedgwick, Kansas, United States; citing enumeration district (ED) 107-108A, sheet 8B, family 233, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1275.