The actor who played the Exec. ADA before Sam Waterston was Michael Moriarty. The character was Ben Stone.
The Official 24 Magazine will be out April 10th.
"This exciting new bi-monthly magazine brings you exclusive cast and crew interviews, highlights from the show, behind-the-scenes features, posters, competitions, all the latest news, and so much more… Plus don’t miss the fantastic 24 art cards, free with this issue! "
Click here for more details!
(My apologies in advance if this news is redundant!)