He founded the law firm Richards, Layton & Finger in Wilmington, Delaware. - son Louis' obituary
Found him on the 1900 Wilmington Ward 5, New Castle, Delaware census (dist 18 img 7) as
Aaron Finger age 10.
Found him on the 1910 Wilmington Ward 5, New Castle, Delaware census (dist 32 img 10) as
Aaron Finger age 19. Stenographer, law office.
On his WWI draft registration his occupation was Deputy Judge Municipal Court city of Wilmington, Delaware. - 5 June 1917
Found him on the 1920 Wilmington Ward 9, New Castle, Delaware census (dist 112 img 18) as
Aaron Finger age 29, attorney, general practice.
Deputy Judge Aaron Finger of the Wilmington Municipal Court, has been named Chief Deputy Attorney-General by Sylvester D. Townsend, Attorney-General-elect of Delaware. Mr. Townsend has also appointed as a Deputy Attorney General for New Castle
county Clarence A. Southerland.
Judge Finger and Mr. Southerland are prominent members of the New Castle county bar. Mr. Finger is associated in law practice with Robert H. Richards, formerly attorney-general. - Newark Post November 10, 1920
Found him on the 1930 Wilmington, New Castle, Delaware census (dist 57 img 21) as
Aaron Finger age 40, attorney at law.
Found him on the 1940 Wilmington, New Castle, Delaware census (dist 4-83 img 14) as
Aaron Finger age 49, lawyer, private firm.