Richard T KrehRichard T. Kreh, Sr., is a retired master mason, a former building trades and masonry instructor with Linganore High School (Frederick, Maryland), and a well-known expert in the masonry field. He has written for Taunton Press and Masonry ConstructionMagazine, in addition to authoring several respected textbooks, including SAFETY FOR MASONS. He holds bachelor�s and master�s degrees in education. Read More Read Less