Frank "Skip" Groff (November 20, 1948 – February 18, 2019) was an American record producer, disc jockey, and owner of Yesterday and Today record store (also known as Y&T) in Rockville, Maryland, at the center of much of Washington D.C.'s punk and alternative music scenes.

[4] Called "a respected guru" of the DC punk and indie music scene, Groff was a radio DJ for WINX, WAVA, and WPGC, and did promotional work for RCA, before opening Yesterday and Today in September 1977.

[5] When the band Minor Threat broke up, its frontman Ian MacKaye worked at the store for five years.

Other employees at Yesterday and Today included: Kim Kane of the Slickee Boys, Bert Queiroz and Danny Ingram of Youth Brigade, Brendan Canty and Guy Picciotto of Rites of Spring and Fugazi, Sharon Cheslow of Chalk Circle, Tommy Keene and Ted Niceley of The Razz, Shirley Sexton (later married to Stiff Little Fingers' Jake Burns), Amanda MacKaye who ran Slowdime Records, and Archie Moore and Jim Spellman of Velocity Girl.

[5] Groff produced albums for many of the DC area's punk bands including the Slickee Boys, Razz, Bad Brains, Teen Idles, S.O.A., Dark, Nurses, Youth Brigade, Black Market Baby, Velvet Monkeys, and Minor Threat.