- 9 September 1967 - Homer is born to Randolph and Blanche Cohen in Boulder, Colorado.
- 3 September 1973 - Homer begins attendance at Louisville Elementary School.
- 12 January 1974 - Homer is diagnosed with Asperger's Syndrome.
- 1 September 1978 - Homer begins attendance at Louisville Middle School.
- 1 September 1982 - Homer begins attendance at Monarch High School.
- 1 September 1986 - Homer begins attendance at Princeton University.
- 6 May 1989 - Homer graduates from Princeton University and earns a Bachelor's Degree in Mathematics.
- 23 October 1995 - Homer adopts Carrie Cohen.
- 30 April 1998 - Homer adopts Barlow, a Havanese dog.