UPDATE: 6/10/14, 8:48 a.m. EDT. The names of the lawyers from Porter Hedges have been added to the seventh and eighth paragraphs of this story.

Two companies linked to billionaire Aubrey McClendon—one of the foremost backers of the so-called U.S. shale gas revolution—made big moves in the energy space Monday. And a handful of large law firms have landed roles on both matters.