Grey Group's international clients include Procter & Gamble, GlaxoSmithKline, Nokia, British American Tobacco, Diageo, Volkswagen, Novartis, Wyeth, Canon, DirecTV, and 3M.

In 1961, billings reached $59 million[7] and in the same year, Herbert D. Strauss was named president and the firm expanded domestically and internationally.

[10] In the 1970s, Grey was responsible for several popular ad campaigns including Star Wars toys for Kenner, aspirin and toothpaste for SmithKline, and Stove Top Stuffing for Kraft General Foods.

On March 7, 2005 (2005-03-07), WPP Group beat out Havas in a race to acquire Grey Global, the seventh-largest advertising agency at the time,[citation needed] for approximately US$1.3 billion.

[18] In March 2017, Grey's London office announced its rebranding as Valenstein & Fatt for 100 days, to celebrate its Jewish founders and later executives, and to highlight prejudice in society.

[21] In July 2022, Grey Group named Laura Maness the agency's global CEO, who previously worked at Havas.

"[23] In 1991, Grey Spain conceived for Procter & Gamble an advertising campaign for its Fairy dishwashing liquid for the Spanish market focused on a television commercial in which two fictional towns, Villarriba and Villabajo, compete for the best paella at their popular fiestas.

The commercial was soon dubbed into other languages and used in markets such as the United Kingdom, Germany, Russia, Portugal and Greece, modifying the detergent bottle with the corresponding local one.

Its first ad, Time Sculpture, was a British television and cinema advertisement which comprised a collection of interacting movement loops sequenced into a single shot.

The minute-long ad featured the launch of an armchair into near space attached to a weather balloon at an altitude of 29,952 metres (98,268 ft)—making it the highest-altitude television commercial that had ever been filmed.