1900 census shows Leonard at the Tennessee School for the Deaf and Dumb in Knoxville.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSD3-PGN : 22 January 2015), Leonard B Dickerson, Tennessee School for the Deaf and Dumb Knoxville city, Knox, Tennessee, United States; citing sheet 1A, family , NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,581.
His WW1 draft card prepared September 1918 reveals a middle name of Bismarck, residence in Tipton, Georgia and a printers trade. He lists Nannie as his contact. His birthdate is given as January 11, 1884.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:KZZ2-9FV : 12 December 2014), Leonard Bismarck Dickerson, 1917-1918; citing Tift County, Georgia, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,558,646.
This October 1922 paper named The Deaf Mutes Journal notes the revival of a newspaper named The Southern Optimist and Leonard is listed as the Advertising Manager.
1940 census shows Leonard and Nannie with sons James Jackson and Leonard and mother-in-law Lula Boykin Jackson. He s a Linotype operator in a print shop.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K756-CMZ : accessed 31 August 2016), Leonard B Dickerson, Ward 2, Atlanta, Atlanta City, DeKalb, Georgia, United States; citing enumeration district (ED) 160-290, sheet 5B, family 125, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 727.