James Todd Smith aka LL Cool J (short for Ladies Love Cool James), is an American hip hop recording artist, record producer, actor, author and entrepreneur from Queens, New York. He is known for such hip hop hits as "Going Back to Cali", "I'm Bad", "The Boomin' System", "Rock the Bells" and "Mama Said Knock You Out", as well as romantic ballads such as "Doin' It", "I Need Love", "All I Have", "Around the Way Girl" and "Hey Lover".

A two-time Grammy Award winner, LL Cool J has released 13 studio albums and two greatest hits compilations. His twelfth album Exit 13 (2008), was his last for his long-tenured deal with Def Jam Recordings. In 2010, VH1 has placed him on their "100 Greatest Artists Of All Time" list.

LL Cool J appeared in numerous films, including In Too Deep, Any Given Sunday, S.W.A.T., Mindhunters, and Edison. He currently plays NCIS Special Agent Sam Hanna in the CBS crime drama television series NCIS: Los Angeles. LL Cool J also is the host of Lip Sync Battle on Paramount Network.

Radio was released to critical acclaim, both for production innovation and LL's powerful rap. Released November 18, 1985, on Def Jam Recordings in the United States, Radio earned a significant amount of commercial success and sales for a hip hop record at the time. Shortly after its release, the album sold over 500,000 copies in its first five months, eventually selling over 1 million copies by 1988, according to the Recording Industry Association of America. Radio peaked at number 6 on the Top R&B/Hip-Hop Albums chart and at number 46 on the Billboard 200 albums chart. It entered the Top R&B/Hip-Hop Albums chart on December 28, 1985, and remained there for forty-seven weeks, while also entering the Pop Albums chart on January 11, 1986, remaining on that chart for thirty-eight weeks. By 1989, the album had earned platinum status from the Recording Industry Association of America (RIAA), with sales exceeding one million copies; it had previously earned a gold certification in the United States on April 14, 1986. "I Can't Live Without My Radio" and "Rock the Bells" were singles that helped the album go platinum. It eventually reached 1,500,000 in US sales.

With the breakthrough success of his hit single "I Need a Beat" and the Radio LP, LL Cool J became one of the first hip-hop acts to achieve mainstream success along with Kurtis Blow and Run-D.M.C.. Gigs at larger venues were offered to LL as he would join the 1986-'87 Raising Hell tour, opening for Run-D.M.C. and the Beastie Boys. Another milestone of LL's popularity was his appearance on American Bandstand as the first hip hop act on the show, as well as an appearance on Diana Ross' 1987 television special, Red Hot Rhythm & Blues.

The album's success also helped in contributing to Rick Rubin's credibility and repertoire as a record producer. Radio, along with Raising Hell (1986) and Licensed to Ill (1986), would form a trilogy of New York City-based, Rubin-helmed albums that helped to diversify hip-hop. Rubin's production credit on the back cover reads "REDUCED BY RICK RUBIN", referring to his minimalist production style, which gave the album its stripped-down and gritty sound. This style would serve as one of Rubin's production trademarks and would have a great impact on future hip-hop productions. Rubin's early hip hop production work, before his exit from Def Jam to Los Angeles, helped solidify his legacy as a hip hop pioneer and establish his reputation in the music industry.

LL Cool J's second album was 1987's Bigger and Deffer, which was produced by DJ Pooh and the L.A. Posse. This stands as one of his biggest-selling career albums, having sold in excess of two million copies in the United States alone.  It spent 11 weeks at #1 on Billboard's R&B albums chart. It also reached #3 on the Billboard's Pop albums chart. The album featured the singles "I'm Bad", the revolutionary "I Need Love" - LL's first #1 R&B and Top 40 hit, "Bristol Hotel", and "Go Cut Creator Go". While Bigger and Deffer, which was a big success, was produced by the L.A. Posse (at the time consisting of Dwayne Simon, Darryl Pierce and, according to himself the most important for crafting the sound of the LP, Bobby "Bobcat" Ervin), Dwayne Simon was the only one left willing to work on producing LL Cool J's third album Walking with a Panther.  Released in 1989, the album was a commercial success, with several charting singles ("Going Back to Cali," "I'm That Type of Guy," "Jingling Baby," "Big Ole Butt," and "One Shot at Love"). Despite commercial appeal, thealbum however was often criticized by the hip-hop community as being too commercial and materialistic, and for focusing too much on love ballads As a result, his audience base began to decline due to the album's bold commercial and pop aspirations.  According to Billboard, the album peaked at #6 on the Billboard 200 and was LL Cool J's second #1 R&B Album where it spent four weeks.

In 1990, LL released Mama Said Knock You Out, his fourth studio album. The Marley Marl produced album received critical acclaim and eventually went double Platinum selling over two million copies according to the RIAA. Mama Said Knock You Out marked a turning point in LL Cool J's career, as he proved to critics his ability to stay relevant and hard-edged despite the misgivings of his previous album.  LL won a Grammy Award for Best Rap Solo Performance in 1992 for the title track. The album's immense success propelled Mama Said Knock You Out to be LL's top selling album of his career (as of 2002) and solidified his status as a hip-hop icon. 

After acting in The Hard Way and Toys, LL Cool J released 14 Shots to the Dome. The album had four singles ("How I'm Comin'", "Back Seat (of My Jeep)", the strangely titled "Pink Cookies in a Plastic Bag Getting Crushed by Buildings”, “Stand By Your Man") and guest-featured labelmates Lords of the Underground on "NFA-No Frontin' Allowed". The album went gold.

LL Cool J starred in In the House, an NBC sitcom, before releasing Mr. Smith (1995), which went on to sell over two million copies. Its singles included "Doin' It" and "Loungin". Another of the album's singles, "Hey Lover", featured Boyz II Men, and sampled Michael Jackson's "The Lady in My Life"; it eventually became one of the first hip-hop music videos to air on VH1. The song also earned him a Grammy Award. Yet another single from the album, "I Shot Ya Remix", included vocal work by Foxy Brown. In 1996, Def Jam released this "greatest hits" package, offering a good summary of Cool J's career, from the relentless minimalism of early hits such as "Rock the Bells" to the smooth-talking braggadocio that followed. Classic albums including Bigger and Deffer and Mama Said Knock You Out are well represented here. In 1997, he released the album Phenomenon. The singles included "Phenomenon" and "Father". The official second single from Phenomenon was "4, 3, 2, 1", which featured Method Man, Redman & Master P and introduced DMX and Canibus.

LL Cool J's 11th album, Todd Smith, was released on April 11, 2006. It includes collaborations with 112, Ginuwine, Juelz Santana, Teairra Mari and Freeway. The first single was the Jermaine Dupri-produced "Control Myself" featuring Jennifer Lopez. They shot the video for "Control Myself" on January 2, 2006 at Sony Studios, New York. The second video, directed by Hype Williams, was "Freeze" featuring Lyfe Jennings.

In July 2006, LL Cool J announced details about his final album with Def Jam Recordings, the only label he has ever been signed to. The album is titled Exit 13. The album was originally scheduled to be executively produced by fellow Queens rapper 50 Cent. Exit 13 was originally slated for a fall 2006 release, however, after a 2-year delay, it was released September 9, 2008 without 50 Cent as the executive producer. Tracks that the two worked on were leaked to the internet and some of the tracks produced with 50 made it to Exit 13. LL Cool J partnered with DJ Kay Slay to release a mixtape called "The Return of the G.O.A.T.". It was the first mixtape of his 24-year career and includes freestyling by LL Cool J in addition to other rappers giving their renditions of his songs. A track entitled "Hi Haterz" was leaked onto the internet on June 1, 2008. The song contains LL Cool J rapping over the instrumental to Maino's "Hi Hater". He toured with Janet Jackson on her Rock Witchu tour, only playing in Los Angeles, Chicago, Toronto, and Kansas City. In September 2009, LL Cool J released a song about the NCIS TV series. It is a single and is available on iTunes. The new track is based on his experiences playing special agent Sam Hanna. "This song is the musical interpretation of what I felt after meeting with NCIS agents, experienced Marines and Navy SEALs," LL Cool J said. "It represents the collective energy in the room. I was so inspired I wrote the song on set."

In March 2011 at South by Southwest, LL Cool J was revealed to be Z-Trip's special guest at the Red Bull Thre3Style showcase. This marked the beginning of a creative collaboration between the rap and DJ superstars. The two took part in an interview with Carson Daly where they discussed their partnership. Both artists have promised future collaborations down the road, with LL Cool J calling the duo "organic" One early track to feature LL's talents was Z-Trip's remix of British rock act Kasabian's single "Days Are Forgotten", which was named by influential DJ Zane Lowe as his "Hottest Record In The World" and received a favorable reception in both Belgium and the United Kingdom. In January 2012, the pair released the track "Super Baller" as a free download to celebrate the New York Giants Super Bowl victory. The two have been touring together since 2011, with future dates planned through 2012 and beyond.

In June 2012, LL Cool J began work on his thirteenth studio album. Stating, "I'm going to be doing a little bit of the album on the [My Connect Studio], make sure that it is official."

On October 6, 2012, LL Cool J released a new single from Authentic Hip-Hop called "Ratchet". Following that, on November 3, 2012, LL Cool J collaborated with Joe and producers Trackmasters with his 2nd single, "Take It".

LL Cool J has hosted the Grammy Awards Show for five consecutive years, from the 54th Grammy Awards on February 12, 2012, through the 58th Grammy Awards on February 15, 2016.

On February 8, 2013, it was announced the album title would be changed from Authentic Hip-Hop to Authentic with a new release date of April 30, 2013, and a new cover was unveiled at the same time. At around the same time, it was announced that LL Cool J had collaborated with Van Halen guitarist Eddie Van Halen on two tracks on the album.

On October 16, 2013, the Rock and Roll Hall of Fame announced LL Cool J as a nominee for inclusion in 2014.

In October 2014, he announced his upcoming 14th studio album will be called G.O.A.T. 2 with a release window of 2015. LL Cool J stated about the album "the concept behind the album was to give upcoming artists an opportunity to shine, and put myself in the position where I have to spit bars with some of the hardest rhymers in the game"; however, the album was put on hold. LL Cool J explained the reason for it, saying, "It was good but I didn’t feel like it was ready yet."

On January 21, 2016, LL Cool J received a star on the Hollywood Walk of Fame.

In March 2016, LL Cool J had announced his retirement on social media, but quickly announced coming out of retirement and that another new album is on the way.

In July 2016, LL appeared on ABC's Greatest Hits.

In October 2018, LL Cool J was nominated for the Rock and Roll Hall of Fame.

While LL Cool J first appeared as a rapper in the movie Krush Groove (performing "I Can't Live Without My Radio"), his first acting part was a small role in a high school football movie called Wildcats. He landed the role of Captain Patrick Zevo in the 1992 film Toys in which he shared the silver screen with Robin Williams. In 1995, he starred in his own television sitcom, In the House. He portrayed an ex-Oakland Raiders running back who finds himself in financial difficulties and is forced to rent part of his home out to a single mother and her two children.

In 1998, LL Cool J had a role in the film Halloween H20. In 1999, he starred alongside Samuel L Jackson, Saffron Burrows, Thomas Jane and Jacqueline McKenzie in Deep Blue Sea; in that film, he played a wise-cracking cook on a top-secret sea base besieged by genetically enhanced sharks. He received rave reviews for his role as Dwayne Gittens, an underworld boss nicknamed "God", in In Too Deep. Later that year, he starred as Julian Washington--a talented but selfish running back on the dysfunctional Miami Sharks--in Any Given Sunday. Since then, LL Cool J has appeared in 2002 remake of Rollerball, Deliver Us from Eva, Mindhunters, and S.W.A.T.

In 2005, he returned to television in a guest-starring role on the Fox medical drama House; he portrayed a death row inmate felled by an unknown disease in an episode entitled "Acceptance". He appeared as Queen Latifah's love interest in the 2006 movie Last Holiday. He also guest-starred on 30 Rock in the 2007 episode "The Source Awards", portraying a hip-hop producer called Ridikulous who Tracy Jordan fears may kill him. LL Cool J appeared in Sesame Street's 39th season, introducing the word of the day--"Unanimous"--in episode 4169 (September 22, 2008) and performing "The Addition Expedition" in episode 4172 (September 30, 2008).

Since 2009, LL Cool J has starred on the CBS police procedural NCIS: Los Angeles. The show is a spin-off of NCIS, which itself is a spin-off of the naval legal drama JAG). LL Cool J portrays NCIS Special Agent Sam Hanna, an ex–Navy SEAL who is fluent in Arabic and is an expert on West Asian culture. The series debuted in autumn of 2009, but the characters were introduced in an April 2009 crossover episode on the parent show.

LL Cool J appeared in a cameo role, where he is credited with being the product lead of Google's Gmail Tap, an April Fool's Day joke launched by the Gmail team, purporting to bring a Morse Code keyboard to the platform.

Since April 2015, LL has hosted the show Lip Sync Battle.

LL Cool J worked behind the scenes with the mid-1980s hip-hop sportswear line TROOP. LL Cool J launched a clothing line (called "Todd Smith"). The brand produces popular urban apparel. Designs include influences from LL's lyrics and tattoos, as well as from other icons in the hip-hop community. LL Cool J has written four books, including 1998's I Make My Own Rules, an autobiography cowritten with Karen Hunter. His second book was the children-oriented book called And The Winner Is... published in 2002. In 2006, LL Cool J and his personal trainer, Dave "Scooter" Honig, wrote a fitness book titled The Platinum Workout. His fourth book, LL Cool J (Hip-Hop Stars) was cowritten in 2007 with hip-hop historian Dustin Shekell and Public Enemy's Chuck D.

LL Cool J started his own businesses in the music industry such as the music label in 1993 called P.O.G. (Power Of God) and formed the company Rock The Bells to produce music. With the Rock The Bells label, he had artists such as Amyth, Smokeman, Natice, Chantel Jones and Simone Starks. Rock the Bells Records was also responsible for the Deep Blue Sea soundtrack for the 1999 movie of the same name. Rufus "Scola" Waller was also signed to the label, but was released when the label folded. LL Cool J founded and launched Boomdizzle.com, a record label / social networking site launched in September 2008. The website accepts music uploads from aspiring artists, primarily from the hip-hop genre, and the site's users rate songs through contests, voting, and other community events.

LL Cool J also appeared in an introduction to Wrestlemania 31.

In 2017, LL Cool J became the first rapper to receive Kennedy Center Honors.

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