This was a shock to read...
As Edna Krabappel on The Simpsons, Marcia Wallace may be the only 4th-grade teacher to have the same student for 24 years. Before that, she was beloved as Carol Kester, the lovelorn, wisecracking secretary on The Bob Newhart Show.
http://www.imdb.com/news/ni56352744/?ref_=hm_nw_tv_t1