Barry Adrian Reese (born July 7, 1982), better known by his stage name Cassidy, is an American rapper from Philadelphia, Pennsylvania.

He first garnered attention for his freestyles and competitions as a battle rapper in the late 1990s, and formed the Philadelphia-based hip hop collective Larsiny Family by the end of the decade.

He adopted a commercially-oriented approach for his 2003 debut single "Hotel" (featuring R. Kelly) and its follow-up, "Get No Better" (featuring Mashonda); the former peaked at number four on the Billboard Hot 100 while both preceded the release of his debut studio album, Split Personality (2004).

Billboard 200, while his second album, I'm a Hustla (2005), peaked at number five and was supported by the lead single of the same name—which received platinum certification by the Recording Industry Association of America (RIAA).

Larsiny was discovered in Philadelphia by record producer Swizz Beatz's father Terrence Dean, and in turn, the group signed to the Ruff Ryders-subsidiary label TD Entertainment.

The next single, "B-Boy Stance", features vocals and production from his mentor, Swizz Beatz.

[3] In 2006, after his release from prison and recovering from an auto wreck, Cassidy began work on his third studio album, B.A.R.S.

[4] The album was released on November 6, 2007, debuting at number 10 on the Billboard 200, with 63,000 copies sold in the first week.

[5] The album was led by the single "My Drink n My 2 Step", featuring vocals and production from Swizz Beatz.

While preparing his fourth studio album, he released a mixtape series entitled Apply Pressure.

They participated in a "twitter beef" after which Cassidy released "The Diary of a Hustla" which was originally thought to be a diss towards Meek.

[20] At his arraignment on Saturday, June 18, he was denied bail, and sent to Philadelphia's Curran-Fromhold Correctional Facility, a high-security prison, where he would serve his time during the trial and after he was sentenced.

On January 25, 2006, Cassidy was convicted of involuntary manslaughter, two counts of aggravated assault and possession of an instrument of crime for his involvement in the shooting.

[22][23] Cassidy was released from Pennsylvania's Curran-Fromhold Correctional Facility on March 2, 2006, after serving eight months.

Cassidy was seriously injured in a vehicle wreck on the night of October 5, 2006, when a commercial truck collided with his SUV, in which he was a passenger.

He was taken to the Jersey City Medical Center, where he was diagnosed with a fractured skull and several broken bones on the left side of his face.