Łukasz Sebastian Gottwald (born September 26, 1973),[3] known professionally as Dr. Luke, Tyson Trax, and Made in China, is an American musician, songwriter, and record producer.

He began his professional music career as the Saturday Night Live Band's lead guitarist in 1996.

Gottwald continued to co-write and produce commercially successful songs such as "Who Knew" (2006) for Pink, "Girlfriend" (2007) for Avril Lavigne,[4] and "I Kissed a Girl" (2008) for Katy Perry, before leaving Saturday Night Live and reuniting with Clarkson for "My Life Would Suck Without You" (2009).

[12] He released the 12" single "Wet Lapse", under the name Kasz, for Rawkus Records, and remixed the theme from the film Mortal Kombat.

[3] In 2004, he co-wrote and co-produced the Kelly Clarkson Billboard Hot 100 number two song, "Since U Been Gone" with Max Martin[3] and provided the singer another hit in "Behind These Hazel Eyes".

US Billboard number one, "I Kissed a Girl" and "Hot n Cold", as well as three songs to Britney Spears' 2008 album, Circus,[4] including the title track.

[17][18] At the start of 2011, Advertising Age called Gottwald "the year's most successful producer and songwriter in terms of chart longevity.

"[19] In 2011 Gottwald co-executive produced Britney Spears' seventh studio album Femme Fatale alongside Max Martin.

On the week ending March 3, 2012, Gottwald's co-production for Katy Perry's "Part of Me" became the 20th song to debut atop the Billboard Hot 100.

He also produced Perry's single "Wide Awake", which peaked at number 2 on the Billboard Hot 100, whilst topping the US Pop Songs chart.

[20] In October 2014, Kesha filed a lawsuit against Gottwald, claiming sexual assault and battery, sexual harassment, gender violence, civil harassment, violation of California's laws against unfair business practices, infliction of emotional distress (both intentional and negligent), and negligent retention and supervision.

Sebert filed a civil suit against Gottwald in October 2014 for infliction of emotional distress, sex-based hate crimes and employment discrimination.

[41] This New York lawsuit resulted in the staying (or a stop to the legal proceedings) of a California lawsuit where Kesha claimed Dr. Luke was liable for sexual harassment, misogyny, civil harassment, violation of California's laws against unfair business practices, infliction of emotional distress (both intentional and negligent), and negligent retention and supervision.

[41] In her New York counter-claim, Kesha alleged that Dr. Luke "sexually, physically, verbally and emotionally" abused her since the beginning of their professional relationship.

The suit alleged he drugged and raped her on two occasions, made threats against Kesha and her family, and called her derogatory names.