Nationally acclaimed youth speaker Mark Brown will present an anti-bullying talk to fifth and sixth graders in Great Bend on Tuesday. Brown is scheduled to speak at 1:45 p.m. at Holy Family School. Fifth and sixth graders from Lincoln Elementary School will also attend the program at HFS, said Kim Griffith with Great American Opportunities.Brown has dedicated his career to getting inspirational messages out to young people all over North America, Griffith said.