** SPOILER ALERT ** Don't say you weren't warned...
When Leslie Ackerman said her $3500 would go to "Cure Cancer Through Immunization" at UCLA, I wondered if anything ever became of that (I don't recall any "cancer vaccine" being developed yet). A bit of checking shows that UCLA's "Cure Cancer Through Immunization Therapy" program became the John Wayne Cancer Clinic, and is now the John Wayne Cancer Institute - and apparently, they were getting somewhere in 2002, although a drug they were working on failed a clinical trial in 2005.
Speaking of "Whatever Happened To...":
Leslie Ackerman did make Skag with Karl Malden, but the show lasted two months, and she hasn't been on more than one episode of a series since then, although she starred in (and wrote) the 2000 movie What's Eating You?. (Supposedly, she's now best known as "the waitress in the 'Trials and Tribble-ations' episode of Star Trek: Deep Space Nine".
Ken Michaelman, after being Goldstein on The White Shadow, hasn't done anything of real note either, athough he may have been in multiple episodes of The Bradys (the CBS drama version).
Tamara Dobson (supposedly "the tallest leading lady in film" at one point) died in 2006 of MS.
It's probably easier to list what Robert Mandan hasn't been on, although his only "starring" prime-time role since Soap was on Three's a Crowd (no, not the game show - the Three's Company spinoff; he played Jack's father-in-law).
-- Don