Ashton Lewis has answered over 300 questions as Mr. Wizard in Brew Your Own magazine, where he also serves as technical editor. Lewis has a master's degree in brewing science from the University of California–Davis and is the head brewer at Springfield Brewing Company in Missouri.Richard L. Bitner is a garden writer and photographer whose work has appeared in numerous national and regional magazines. He studied horticulture at Longwood Gardens in Pennsylvania, where for many years he has been an instructor in the Continuing Education program. He is a member of the Pennsylvania Horticultural Society's Gold Medal Plant Award Committee, and has made it his mission to promote the appreciation and use of conifers. His previous Timber Press books are Conifers for Gardens and Timber Press Pocket Guide to Conifers.