In the years following Idol, Studdard has released four studio albums, including his most recent disc, 2009's Love Is.

In addition to appearing on various television shows he has toured with Robin Givens in the comedy-drama Heaven I Need a Hug and in 2008 accepted the role of Fats Waller in a national tour of Ain't Misbehavin'.

Studdard, who was born in Frankfurt, Germany while his American father was stationed there with the U.S. Army, grew up in Birmingham, Alabama. The youngest son of two teachers, at the age of three he sang for the first time at the Rising Star Baptist Church in his hometown of Birmingham. He continued singing gospel in church, performing solos as a child while his mother sang in the local choir. While at Huffman High School, he played football for which he received a scholarship to Alabama A&M University. While at Alabama A&M he joined the Omicron Delta chapter of Phi Mu Alpha Sinfonia, the mens music fraternity of America.

After growing up listening to his mother's Donny Hathaway albums, Fred Hammond, and gospel music, Studdard began to pursue a career in the music industry, majoring in voice studies at Alabama A&M. He sang with Just a Few Cats, a popular local Birmingham jazz and R&B band founded by members of Ray Reach's UAB Jazz Ensemble, along with other local musicians. "A lot of people don't realize how hard I was trying to get into the business before American Idol," Studdard related several years later. "I was making demos and just working so hard." A back-up singer from Just a Few Cats asked him to accompany her to Nashville, Tennessee for an audition on the 2003 second season of "American Idol".

When auditioning, Studdard sang Stevie Wonder's "Ribbon in the Sky." This guided him to being one of the local finalists. On American Idol, he impressed viewers with his performances of the Leon Russell/Bonnie Bramlett song "Superstar" (originally a hit for The Carpenters and Luther Vandross) and the Peabo Bryson/Regina Belle duet "A Whole New World"; during his time on the show, Studdard received praise from music legends such as Lionel Richie, Neil Sedaka, Robin Gibb of the Bee Gees, Luther Vandross, and Gladys Knight.

During the televised competition, Studdard gained the nickname "Velvet Teddy Bear" and was noted for his shirts printed with "205", the telephone area code of his hometown of Birmingham. Studdard also did a cover version of "For All We Know", originally recorded by Donny Hathaway, whose music he grew up with.

He won the contest over runner-up Clay Aiken by only 134,000 votes out of 24,000,000 cast in the May 2003 finale, becoming the second American Idol winner.

Alabama Governor Bob Riley declared March 11, 2003 as "Ruben Studdard Day".

Studdard released his first single, a cover of Westlife's "Flying Without Wings" (which he had sung on the show's finale), produced by the The Underdogs and Babyface, a month later in June 2003. Fueled largely by sales, it debuted at #2 on the Billboard Hot 100. In December 2003, advance orders for his album Soulful topped the 1 million mark before it was released into stores. The album debuted at number one on the Billboard 200 album chart that month, selling over 400,000 copies in its first week and attaining the second highest first-week sales of any American Idol winner. The single "Sorry 2004" from this album found substantial airplay, reaching #9 in the Billboard Hot 100 and #2 on the Billboard R&B singles chart. Studdard received a Grammy Award nomination in December 2003 for Best Male R&B Vocal Performance for "Superstar", nominated with his idol Luther Vandross (Vandross won that category). In March 2004, Ruben won the NAACP Outstanding New Artist award.

Studdard released the gospel album I Need an Angel on November 23, 2004. The title track and first single "I Need an Angel" was a cover of a 2002 single performed by R&B singer Daniel DeBourg and written by R. Kelly. The album sold over 96,000 copies in its first week, it also entered the Gospel charts at #1, opened at #20 on the Billboard 200 chart, it since has sold over 500,000 copies. It was also #1 on the 2005 Billboard Year-End Gospel Albums Chart. As of June 2007, Studdard is the fifth-best selling American Idol performer with more than 2.4 million albums sold in the U.S.