Tim Twomey, senior vice president and deputy general counsel for CallisonRTKL (Baltimore) and former general counsel of RTKL Associates Inc., has announced his retirement.

Twomey spent 43 years in the industry and has been with the firm for more than a decade. As an architect and attorney, he also worked on the AIA Documents Committee and the AIA Risk Committee, authored articles and textbooks, and served as a teacher and mentor.

He will continue as a lecturer in professional practice at the Harvard Graduate School of Design (Cambridge, Mass.).