For what is Olga Mallsnerd known?

In the 1984 movie 2010 (Sequel to 2001: A Space Odyssey) Olga Mallsnerd is the pseudonym used by Candace Bergen for the voice of SAL.

From https://en.wikipedia.org/wiki/HAL_9000:

"In the film version, SAL is voiced by Candice Bergen, who was credited only under a pseudonym (as 'Olga Mallsnerd', a combination of the surname of Bergen's husband, director Louis Malle and that of Mortimer Snerd, one of her father Edgar Bergen's famous puppet characters)."