He had been a state senator representing the 27th District (Calvert, Charles, and Prince George's Counties) from 1975 to 2020 and served as its President from 1987 to 2020.

[2] Miller was born in Clinton, Maryland on December 3, 1942, the first of ten siblings,[3] and attended Surrattsville High School.

[citation needed] The Main Administration Building at his alma mater, the University of Maryland, College Park, was named after him on June 29, 2020.

"[5] Miller was featured in the Netflix documentary The Keepers for his opposition to a bill seeking to increase the statute of limitations for sexual abuse victims.

[6][failed verification] On October 24, 2019, he announced he would step down from his leadership post, citing fatigue caused by his cancer treatment.