Very Important Person

(1961)

Writer

The Fight for Rome II - The Betrayal

(1969)

Adaptation

The Professional

(1973)

Writer

Alternative 3

(1977)

Writer

The Fifth Musketeer

(1979)

Screenplay

Disaster on the Coastliner

(1979)

Writer

A Man Called Intrepid

(1979)

Writer

The Final Countdown

(1980)

Screenplay and Story

The Survivor

(1981)

Screenplay

A Dangerous Summer

(1982)

Screenplay

Amityville 3-D

(1983)

Writer

D.A.R.Y.L.

(1985)

Writer

Blackout

(1985)

Screenplay and Story

Taffin

(1988)

Screenplay

The French Revolution

(1989)

Screenplay

Year of the Gun

(1991)

Screenplay

Fall from Grace

(1994)

Writer

Remembrance

(1996)

Teleplay

Il gioco

(2001)

Screenplay

That's Outrageous

(1983)

Client

The Best Democracy Money Can Buy

(2016)

Director

Vigilante

(2023)

Director