CTLGroup is an engineering, testing, and consulting firm that began in 1916 as the research and development laboratory for the Portland Cement Association (PCA), which was formed to develop the use of portland cement in construction.

Portland cement became the most common construction material. Demand for consulting grew over the years, eventually expanding into other building materials and engineering issues. In 1987 CTLGroup became an independent firm, offering engineering, testing, and consulting services. First known as “Construction Technology Laboratories,” the firm changed its name to “CTLGroup” in 2005 to reflect the fact that it provides both laboratory services as well as engineering consulting services.

Scientists and engineers at the firm include W. Gene Corley, the “preeminent expert on building collapse investigations and building codes” and T.D. Lin, who studied the physical properties of concrete made with lunar soil, also referred to as lunarcrete. The firm's projects include involvement in the construction of the Burj Khalifa, the World Trade Center collapse investigation and work at the Stonecutters Bridge.

Joachim Garraud, was born in 1968 in Nantes, is a French DJ, but he is also a remixer and producer. He is the producer of stars such as Geyster, Paul Johnson, Deep Dish, David Bowie, OMD, Kylie Minogue, Mylène Farmer, Cassius, Belamour, Kid Vicious, Saffron Hill and Culture Club.

Known for his many collaborations with other DJs and musicians like David Guetta or Jean-Michel Jarre he moderates a weekly radio show on Radio FG that plays a new mix (Zemixx) each week to its listeners before making it available on his Podcast. He is also the Co-founder of various labels:

His mixes are a mixture of traditional DJ and then he remixes live directly onto cd. Certain sounds which he employs had never been heard in House Music before.

Joachim is known for his energetic sets, using images to go with his sounds, as well as the keyboard, and for his setting in scene.

After having perfectionned his piano and percussions for seven years at the conservatory, he decided to move toward electronic music. long with Laurent Garnier, he started as a DJ as the Boy, the Parisian club that first initiated the discovery of the techno phenomenon in France. He then successfully tried some music production with Maxximum radio station, number one national 100% dance radio station (CTL group). Becoming the pioneer of numerical music, he created his own recording studio in the middle of Paris, which allowed him to remix, compose or produce artists such as David Guetta, Jean-Michel Jarre, Paul Johnson, Deep Dish, David Bowie, OMD, Kylie Minogue, Mylène Farmer, Cassius, Cerrone, Moby, Robbie Rivera... and many more. Joachim developed a new concept, blending Deejaying and musical improvisation, thus giving a true concert, a unique live performance which soon gave him the opportunity to perform all over the World. Today, he is surrounded by a big community with the Space Invader mascot.