David Dawson, a shareholder in Winstead’s Austin office, will become the firm’s chairman and chief executive office on April 1, succeeding Kevin Sullivan, who chose not to run for re-election to a second four-year term.

Sullivan, a shareholder in Dallas, said he “completely enjoyed” being chairman and CEO of the Dallas-based firm since the fall of 2010, but had to make a decision this past fall whether to seek a second term or return full time to his booming real estate finance practice. Because his practice was so busy, Sullivan said he was finding it increasingly difficult to juggle his management responsibilities and client work.