Maison Margiela, Marni, Jil Sander and Viktor&Rolf, and one of luxury's most committed long-term investors in China. Born near Padua in 1955, he founded Diesel in 1978 and created OTB as its holding company in 2002.

Under his leadership, OTB has made China a priority market. In 2022, the group opened four flagships for Maison Margiela, Marni, Jil Sander and Amiri at Shanghai's JC Plaza, its largest retail project to date, and in October 2025 Rosso inaugurated OTB's new Asia-Pacific headquarters in Shanghai's Jing'an district, marking Diesel's 20th anniversary in China. In April 2026, Maison Margiela staged a major takeover across China, spanning a global show and couture street installation in Shanghai, an immersive Tabi exhibition in Chengdu, and an interactive public experience exploring the world of bianchetto in Shenzhen. The group operates close to 100 directly owned stores across mainland China, Hong Kong and Macao.

Rosso has also championed young Chinese designers, serving on the jury of the inaugural BoF China Prize in 2019 and the YU Prize committee in 2022, with OTB offering mentorship to winners, and backing collaborations between OTB brands and designers including Xander Zhou, PRONOUNCE and Chen Peng. He regularly meets Chinese students, including at Donghua University in Shanghai. “We don't want to go to this country just to sell, but to create interaction,” he told Jing Daily.