For the first seven of its eight years, Burleson grew organically, building a practice by hiring attorneys to serve its oil and gas clients. That strategy shifted in March, when the Houston-based law firm acquired a Denver energy practice, McGloin, Davenport, Severson & Snow. The move added nine attorneys to the firm’s two-year-old Denver office, increasing its size to 41 lawyers.

"We’ve never done such a big acquisition before," said Rick Burleson, who founded the 137-lawyer firm in Houston in 2005. "It was a good opportunity for us."