Volker Präkelt, born in Recklinghausen in 1956, is the creative head of the science series “Marvi Hämmer”, broadcast by the German tv channels ZDF and KI.KA. Today he works as a freelance author and director for books, audio books and television. He has penned the nine titles in the non-fiction series BAFF!, among others. Limbradur and the Magic of Gravity is his first book for Mixtvision.