Editor's note: This article is the fourth in a series examining how executive-level positions are changing at law firms.

In a legal industry plagued by flat demand, business development is especially critical. So it's only natural that law firm leaders are placing a higher premium on business development professionals.

The chief marketing officer role has become widespread as law firm C-suites grow, and those professionals are gaining influence at their firms. But as their focus shifts from traditional marketing and toward business development, CMO roles are evolving, and more firms are hiring dedicated chief business development officers.