Effects artist Simon Scott, formerly of A52 and Method, has partnered with Mac Guff Ligne in Paris to launch Mac Guff Los Angeles. Their first job included work for Nissan from The Vidal Partnership. . . . Detroit-based editorial houses Griot and STS have merged under the Griot name. STS will maintain its office in Santa Monica. . . . San Diego-based online agency Geary Interactive has opened a new office in New York. . . . Sound design company The Penthouse has opened in New York under the creative guidance of sound engineer John Grant in a facility that is also home to Mad.house's postproduction operations-the two companies plan to work together to offer a range of post services. . . . A Band Apart has signed Deborah Herbert and her agency Y-i to represent its directors for music video work in the U.K.