In the 115 years since it was founded, Tulsa, Okla.-based Doerner, Saunders, Daniel & Anderson has proven itself a regional powerhouse through the long-term relationships forged with its clients. It’s these strong ties that bolster the 42-lawyer firm’s vitality both throughout the state and beyond its borders.

Wayne Cooper, head of the transactional practice group at Doerner Saunders, said the recent national attention on natural gas as an alternative to petroleum has boosted business for many of its clients.