Law firms have been setting up shop and expanding operations in Texas at a frenzied pace—the result of a strong Texas economy, the lure of the state’s high-profile energy sector, and the rainmaking opportunities that exist as the state adds to its long list of corporate headquarters.

It’s not a new thing—some out-of-state firms have had offices in Texas for 30 years. But Texas has lately moved high up in the action list of oh-so-many firms in an unprecedented way. Those already established in the state are expanding. Others, including long-established firms such as New York-based White & Case and Shearman & Sterling, have just joined the roster of firms with outposts in the Lone Star State.