Emeritus ( /ɨˈmɛrɨtəs/; plural emeriti; abbreviation emer.) is a post-positive adjective used to designate a retired professor, bishop, or other professional. The female equivalent, emerita (/ɨˈmɛrɨtə/), is also sometimes used, but phrases such as professor emerita are not in proper usage according to Latin grammar rules.

In many cases the term is conferred automatically upon all persons who retire at a given rank. This is the usual case for retired professors. In other cases, it is used when a person of importance in a given profession retires or hands over the position so that his former rank can still be used in his title.

In the United States, the word is used either as a postpositional adjective (e.g., "professor emeritus"), or as a preposition adjective (e.g., "emeritus professor"). There is a third usage, although not employed as often, in which the word follows a full title (e.g., professor of medicine, emeritus.)

It is also commonly used in business and non-profit organizations to denote perpetual status of the founder of an organization or individuals who moved the organization to new heights as a former key member on the Board of Directors (i.e. Chairman Emeritus; Director Emeritus; President of the Board Emeritus.)

David Eric "Dave" Grohl (born January 14, 1969) is an American rock musician, multi-instrumentalist, and singer-songwriter, who is the lead vocalist, guitarist, primary songwriter and founder of the Foo Fighters, prior to which he was the drummer in the grunge band Nirvana. He is also the drummer and co-founder of the rock supergroup Them Crooked Vultures. Grohl has additionally written all the music and performed all the instruments for his short-lived side projects Late! and Probot, as well as being involved with Queens of the Stone Age numerous times throughout the past decade. He has performed session work (as a drummer) for a variety of musicians, including Garbage, Killing Joke, Nine Inch Nails, The Prodigy, Slash, Juliette Lewis, Tenacious D, Tom Petty and the Heartbreakers, and Lemmy Kilmister.

As a child, Grohl's family relocated from Warren, Ohio, to Springfield, Virginia, a suburb of Washington, D.C. Three years later, when Grohl was six, his parents divorced, and Grohl grew up living with his mother.