Since leaving Gibson, Dunn & Crutcher in 2015 and starting a Manhattan boutique with two others, Jim Walden, a former federal prosecutor, has been busy. The law firm has grown from six to 28 lawyers in three years, handling white-collar criminal defense, investigations and commercial litigation, among other areas.

The boutique sets itself apart from others in a few ways. While the partners have varying degrees of experience, they all generally maintain the same billing rate: $750.