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 Justin Bieber Facts Jennifer Lopez Facts Neymar Facts Chester Bennington Facts Charlize Theron Facts Steve Jobs Facts Leonardo DiCaprio Facts Lady Gaga Facts