Mark Gruner [Edit] By Sticky Facts Editorial StaffMark Gruner biography, ethnicity, religion, interesting facts, favorites, family, updates, childhood facts, information and more:Mark Gruner date of birth:December 29, 1958How old is Mark Gruner?67Where was Mark Gruner born?Fort Leonard Wood, Missouri, USA Tags: birth day 29birth month decemberbirth year 1958 Suggested Posts Michael Jackson Facts Justin Timberlake Facts Florence Henderson Facts Jennifer Lopez Facts Leonardo DiCaprio Facts Charlize Theron Facts Margot Robbie Facts Aaliyah Facts