Derbyshire have elected former England all-rounder and national selector as their new club president.
The 61-year-old received the unanimous support of the county's supervisory board as the main candidate to take over from Willie Tucker.
Miller played 254 matches for the county before joining Essex, taking 888 wickets and scoring 12,027 runs in his first-class career.
"Geoff is the ideal person to take over the reins at a time when we are implementing our Elite Performance model," chairman Chris Grant said.
"With his vast experience inside the ECB, he is uniquely placed to offer advice when called upon in our quest to produce a future England player."
Miller also claimed 60 wickets and scored 1,213 runs in 34 Test match appearances for England.
He went on to enjoy huge success as the England and Wales Cricket Board's national selector, overseeing England's rise to the top of the world rankings in both the Test and 50-over formats.