Mark Geist has been named CEO of Montgomery Asset Management...

Mark Geist has been named CEO of Montgomery Asset Management, succeeding founder R. Stephen Doyle. Mr. Doyle, who remains as chairman, has no plans to leave Montgomery in ‘‘the foreseeable future.’’ In addition, Scott Tuck, formerly chief marketing officer, has been named president, taking over one of Mr. Geist’s former roles. His other role as COO has been filled by David Demarest, who previously served as chief administrative officer.