Answer by taking a quote from the following article:

Newhart was born on September 5, 1929 at West Suburban Hospital in Oak Park, Illinois. His parents were George David Newhart (1899-1986), a part-owner of a plumbing and heating-supply business, and Julia Pauline (nee Burns; 1901-1991), a housewife. His mother was of Irish descent and his father was of English, Irish, and German ancestry. One of his grandmothers was from St. Catharines, Ontario, Canada.

Newhart became famous mostly on the strength of his audio releases, in which he played a solo "straight man". Newhart's routine was to portray one end of a conversation (usually a phone call), playing the comedic straight man and implying what the other person was saying.  His 1960 comedy album, The Button-Down Mind of Bob Newhart, was the first comedy album to make number one on the Billboard charts. The album received the 1961 Grammy Award for Album of the Year. The album peaked at number two in the UK Albums Chart. Newhart also won Best New Artist.  Newhart told a 2005 interviewer for PBS's American Masters that his favorite stand-up routine is "Abe Lincoln vs. Madison Avenue", which appears on this album. In the routine, a slick promoter has to deal with the reluctance of the eccentric President to agree to efforts to boost his image. The routine was suggested to Newhart by Chicago TV director and future comedian Bill Daily, who was Newhart's castmate on the 1970s The Bob Newhart Show for CBS. Newhart became known for using an intentional stammer, in service to his unique combination of politeness and disbelief at what he was supposedly hearing. Newhart has used the delivery throughout his career.  The follow-up album, The Button-Down Mind Strikes Back, was released six months later and won Best Comedy Performance - Spoken Word that same year. Subsequent comedy albums include Behind the Button-Down Mind of Bob Newhart (1961), The Button-Down Mind on TV (1962), Bob Newhart Faces Bob Newhart (1964), The Windmills Are Weakening (1965), This Is It (1967), Best of Bob Newhart (1971), and Very Funny Bob Newhart (1973). Years later, he released Bob Newhart Off the Record (1992), The Button-Down Concert (1997), and Something Like This (2001), an anthology of his 1960s Warner Bros. albums.  On December 10, 2015, it was revealed by publicist and comedy album collector Jeff Abraham that a "lost" Newhart track from 1965 about Paul Revere existed on a one-of-a-kind acetate, which he owns. The track made its world premiere on episode 163 of the Comedy On Vinyl podcast.

Were there any other famous people on any of his albums?
Bob Newhart (