He has written for radio, television, film and the stage. He has received five Emmy nominations and was twice awarded that prize for his original dramas. He has won the Sylvania award, a number of Writers Guild Awards, his dramas have won two Peabody awards, his TV film Conspiracy has won the BAFTA as well.Template:Subject's own narrative, also records of the British Academy of Film and Television Awards, 2002 In 1971-2, he was Head Writer on the CBS Daytime serial Love of Life.Template:Subject's own narrative, 1971-72, also scripts and outlines in Mandel's papers at the University of Wisconsin. Work on Love of Life was done under the pseudonym "Christopher Bell"
In 2004 Mandel received the Paddy Chayefsky lifetime achievement achievement award at the 56th Writers Guild of America Awards.
On June 15, 2010, Steven Bowie interviewed Mandel for the Archive of American Television.
Mandel's papers, scripts, articles and correspondence are collected by the Wisconsin Center for Film and Theater Research, an archive of the University of Wisconsin-Madison and the Wisconsin Historical Society.