Channel 4 hires headhunter in search for new chairman

British broadcaster Channel 4 has hired employment headhunters Zygos Partnership to search for a new chairman when Luke Johnson leaves the company later this year. Johnson, who is known for launching the Pizza Express chain, joined the company in 2004. Zygos, which has been appointed in association with regulator Ofcom, is expected to conduct a wide search that may include a chairman from outside the media industry.