IN: Paul Duane Beauregard, (born January 12, 1977) better known by his stage name DJ Paul, is an American rapper, record producer, DJ, songwriter and entrepreneur from Memphis, Tennessee. He is a founding member of hip-hop group Three 6 Mafia and Da Mafia 6iX and the half-brother of the late rapper Lord Infamous. DJ Paul started his career in the late 1980s as a DJ and released a number of solo tapes, as well as three collaboration albums with Lord Infamous as The Serial Killaz. Juicy J was introduced and the three founded the group Three 6 Mafia, going on to achieve national success in the late 1990s and early 2000s.

In early 2013, DJ Paul focused on performing as a DJ, and created a DJ duo, called S.I.M. (Sex is Mandatory). The group created a number of live sets, as well as remixes to songs, such as Just Blaze & Baauer's "Higher".  In late 2013, Paul and Lord Infamous were discussing creating a sequel to their 1993 album Come with Me 2 Hell, when the latter came with the idea to try and reunite the whole Three 6 Mafia crew. Infamous brought back Crunchy Black, Koopsta Knicca and Gangsta Boo, and the five of them reunited as "Da Mafia 6ix" with plans to release an album in 2014. On November 12, 2013, Da Mafia 6ix released their first mixtape 6ix Commandments. The tape was almost entirely produced by DJ Paul and featured Yelawolf, 8Ball & MJG, Krayzie Bone, Bizzy Bone, SpaceGhostPurrp and HCP affiliates Lil Wyte, Skinny Pimp and La Chat, among others. Juicy J and Project Pat also appeared as surprise guests on the posse song "Body Parts", being credited just as "& more" in the track listing.  DJ Paul collaborated on a mixtape titled Clash Of Da Titans with fellow Memphis producer Drumma Boy that was released on October 23, 2013, and on a free EP, called Black Fall, with rapper Yellawolf, which they put out for Halloween on October 31, 2013. On November 26, 2013, DJ Paul released Volume 16: The Original Masters, a remaster of his 1994 mixtape 4 Da Summer of '94. It was revealed on the PSYR17 EP given away at the 2014 Gathering Of The Juggalos that DJ Paul plans to release his next solo album "Master Of Evil" on Psychopathic Records in 2015. He later confirmed it himself on the 28th of August on The Australia underground hip hop podcast "The Underground Podcast", as well as on the outro song to The Killjoy Club's debut album "Reindeer Games".  DJ Paul has been announced to play South by Southwest showcase in Austin, Texas on March 21, 2015.  On August 19, 2016 DJ Paul announced that he has signed to Yelawolf's Slumerican Records.
QUESTION: what kind of work did he do during that time?
IN: Born in Haddon Township, New Jersey, Donohue grew up in Summit, graduated from the Pingry School in Hillside, and entered Brown University in Providence, Rhode Island. At the age of twenty-two, while a senior at Brown, Donohue began racing his 1957 Corvette. He won the first event he entered, a hillclimb in Belknap County, New Hampshire. He graduated from Brown in 1959 with a bachelor's degree in mechanical engineering.

In 1966, thanks to his friendship with Hansgen, word quickly spread to the Ford Motor Company about the young driver. Ford immediately signed Donohue to drive one of their GT-40 Mk II race cars campaigned at the 24 Hours of Le Mans by the Holman & Moody racing team. Le Mans proved frustrating for Donohue. Hansgen died while testing the GT40 in preparation for Le Mans so Donohue partnered with Australian Paul Hawkins. Donohue and Hawkins only completed twelve laps due to differential failure and finished 47th. Earlier that year, co-driving with Hansgen, Donohue finished third at the 24 Hours of Daytona and second at the 12 Hours of Sebring.  At Hansgen's funeral, Roger Penske spoke to Donohue about driving for him. In his first race for Penske, at Watkins Glen in June 1966, Donohue qualified well but crashed the car at the top of a hill, destroying it.  Donohue was invited back to Le Mans by Ford in 1967. Ford had developed a new GT, the Mark IV. Donohue co-drove in the No. 4 yellow car with sports car driver and race car builder Bruce McLaren for Shelby American Racing. The two drivers disagreed on many aspects of racing and car setup, but as a team were able to muster a fourth-place finish in the endurance classic.  In 1967, Penske contacted Donohue about driving Penske's brand new Lola T70 spyder in the United States Road Racing Championship. Donohue dominated the 1967 race, driving a Lola T70 MkIII Chevrolet for Penske. Donohue raced in seven of the eight races that year, winning six (at Las Vegas, Riverside, Bridgehampton, Watkins Glen, Pacific Raceways, and Mid-Ohio) and finishing third at the Laguna Seca Raceway round behind Lothar Motschenbacher and Mike Goth.  In 1968, Donohue and Penske returned to defend their USRRC championship with the McLaren M6A Chevrolet. Donohue did not start the first race of the year at Circuit Hermanos Rodriguez in Mexico City due to problems getting the engine to start. Despite this, Donohue still dominated the series, even though he suffered three DNFs during the season due to mechanical problems with the M6A.
QUESTION:
when did Mark Join Penske?