After being promoted to director of photography due to his skill at lighting, he met Herschell Gordon Lewis and worked with him in various crew positions on a total of three films.
[1] He founded a production company with director Michael Mann and served as the cinematographer on numerous industrial and education films.
[1] Poster joined the American Society of Cinematographers in 1987, relocating to Hollywood in the process.
He shot the iconic music video to Madonna's "Like a Prayer", as well as commercials directed by Ridley Scott and Kinka Usher.
In 2006, he was elected as the National President of the International Cinematographers Guild, a position he held until 2019.