ICM Partners vet Greg Lipstone is moving to All3Media America as CEO.

Lipstone, ICM’s head of unscripted TV, has long represented All3Media as a client. The company is a collection of production banners housed under the London-based All3Media banner. Discovery Communications and John Malone’s Liberty Global jointly own All3 Media.

Lipstone replaces Eli Holzman, who had served as president. Holzman has left the company.

“Greg’s knowledge of the industry is exceptional, and the combination of his relationships, his reputation, his commercial flair and his drive will play a hugely important part in growing All3Media in the U.S.,” said All3Media CEO Jane Turton. “He has always had a natural ability to bring out the very best in creative talent, and it is very exciting to have him lead All3Media America as we continue to grow the company. He inherits a very strong team and an exciting development and production slate – we are all set for the next phase of growth of All3Media in the U.S.”

All3Media America will remain a client of ICM. Lipstone had been with ICM since 2005, after a 21-year run at William Morris Agency.

“Very rarely do you come across such a diverse global company that is operating in every aspect of the television business,” said Lipstone. “Having worked with All3Media since its inception nearly 12 years ago, I look forward to expanding my role with All3 and Jane in this new capacity.”

All3Media America’s banners include “Undercover Boss” producer Studio Lambert and “Chrisley Knows Best” producer Maverick Television.

ICM Partners said it will name a new head of unscripted in the near future. In a statement the partners of ICM said: “We look forward to continuing to work with (Lipstone) to further the success of All3Media America.”