The very first employee of The WB has moved over to an office at a big time law firm. Twenty-one years after starting at The WB, John Maatta has joined Greenberg Traurig LLP’s Entertainment and Media Practices. With an emphasis on how TV networks, independents and producers structure deals, the now former CW EVP and General Counsel will be based out the international firm’s LA offices.

“From The WB to The CW, we thank John for more than 20 years of service, as well as his important contributions to building two CW Logonew broadcast networks,” CW boss Mark Pedowitz said Tuesday of his long time fellow exec. “We wish John the absolute best in this next chapter of his career.”

In his new role, Maatta will focus on entertainment and media law in addition to issues related to the dissemination of programming by broadcast, cable, and internet-based platforms. A member of the Warner Bros world since 1986 when he started at Lorimar, Maatta eventually moved up to COO of the WB Network. He transitioned over to an exec position at the CW when it was formed in 2006. No replacement for Maatta has been named at the CW, sources say. However, he will be serving a consultant to the network until at least next year as he settles into his new gig.

“We are very pleased to welcome John to the firm and continue to build our strong entertainment practice in Los Angeles,” said Dan Black, the head of Greenberg Traurig’s West Coast Entertainment and Media Practice, today in a statement. “John’s multi-faceted, hands-on television and digital experience, combined with his extensive network of high level contacts, will be a great benefit to our clients.”

The addition of Maatta is the latest move by GT to beef up its global Entertainment and Media practices. Earlier this year, as my colleague Nancy Tartaglione reported, The Weinstein Company lawyers Tom Ara, Robert Sherman joined the firm. Their addition was also joined by associate Rosalind H. Read.