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Michael Jackson
Branca was instrumental in the production and release of Michael Jackson’s Thriller music video. Before Thriller, music videos typically had budgets of $50,000—however, Jackson spent over $1 million on the music video of Thriller. Branca financed it by persuading Showtime to pony up $1.2 million for a Making of "Thriller" video, the first "making of" documentary for a music video.
In the video, Jackson turns into a werewolf. At the time, Jackson was a Jehovah's Witness, and church elders berated him for promoting demonology. Jackson ordered Branca, who had the sole copy, to destroy it. Branca told Jackson that Bela Lugosi, whom Jackson adored, and who played Dracula in the movies, was also religious and had put a disclaimer at the beginning of Dracula stating that he didn't endorse vampirism. This anecdote persuaded Jackson to put a similar disclaimer on Thriller and allow it to be released. In the five days following, the Thriller CD - already out for 1 1/2 years, sold another million copies.
The success of the video caused rock groups and record companies to consider music videos an essential part of the way rock music was packaged and sold.
Branca arranged for Jackson to purchase The Beatles' and Little Richard's publishing catalog in 1985 for $47,000,000. Within a few years the catalog was worth more than $400,000,000. Branca was also instrumental in facilitating the merger of ATV (Jackson's company which held the Beatles song copyrights) with Sony, creating one of the world's largest independent music publishers.
Jackson abruptly left Branca in 1990 when record company mogul David Geffen convinced him that Branca exerted too much control. Jackson re-hired Branca three years later, and Jackson appointed Branca as one of his representatives on the Board of Sony/ATV. In 2006, Branca resigned as Jackson's lawyer and sold back his equity interest in Sony/ATV. Approximately three weeks before he died, Jackson rehired Branca.Main article: Death of Michael Jackson

In the Michael Jackson probate case, Branca produced Jackson's final will and testament, which designated Branca as executor. The Jackson family filed a preemptive probate action in the Los Angeles Superior Court, based on the allegation that Jackson died "intestate," without a valid will. Branca filed the will in Los Angeles on July 1, 2009 and was appointed co-executor. ^[4] Katherin Jackson has since filed a petition to the Court, asking for a determination whether she will be disinherited under the "no-contest" clause of the will if she challenges Branca's appointment as executor.