Mr. Post served as legislative analyst under five different governors during his 28-year tenure, beginning in 1949.
A Renaissance man, Mr. Post also was known as an artist. He displayed his work in multiple shows, and his colored paintings sold well.
As legislative analyst, Mr. Post supervised an office charged with giving accurate, nonpartisan information and analysis to the Legislature.
"We were extremely careful to be virtuous," Mr. Post said in an interview in 1995.
"I've been in an arena in which conflict, differences of opinion, is the stock in trade," he said.
"If they trust you, it is an extraordinary privilege and you simply cannot abuse it."
A native Californian, Mr. Post attended Occidental College, earning a bachelor's degree in economics and art.
He studied art at what was the Chouinard Institute in downtown Los Angeles, now known as the California Institute of the Arts in Valencia. He also completed coursework for a Princeton University doctoral degree in economics but did not write his dissertation, said his son, David Post, of Sacramento.
Mr. Post was preceded in death last year by his wife, Helen, who was an artist in her own right and was third cousin to tennnis champion Helen Wills Moody.
Besides David, Mr. Post is survived by a daughter-in-law Susan, of Sacramento; and by three grandchildren: Allison Post Harris of Alameda, Erin Post Koshal of Toronto, and Matthew Rudd Post of Carmichael.
Details for services are pending.
PHOTO: A. Alan Post wipes paint off his hands after working on a piece in August 2004. Sacramento Bee/Renee C. Byer)
Note: Report by Ellie Shaw and Jim Sanders.