Jonathan Turner will become chief executive of Pen Underwriting, replacing current managing director Mark Armitage. Turner, who joined Pen as executive chairman in September 2015, will adopt full day-to-day management for Pen. Armitage will take on the role of managing director, broking and placement at parent company Arthur J. Gallagher. Grahame Chilton, international CEO of Gallagher said, "Under Mark's steerage the team has brought together and integrated a collection of some of the best known and respected UK underwriters and built one strong, specialist underwriting business that is now the second largest MGA in the UK. That is an incredible achievement in just 18 months and gives Pen, and Jon, solid foundations on which to now build out the strategic growth plans he has been spearheading as executive chairman of Pen. Core objectives include further international expansion and development of Pen's specialist underwriting portfolio, and looking at alternative ways to provide capacity for our customers."