If you listened to our 6-part series on designing homebrew rules, you heard Tom and Greg reference Andy Callan's name many times as the original designer of "Loose Files and American Scramble" back in the 1980s. Loose Files served as the inspiration and jumping off point for what would eventually become British Grenadier and own own modern spin, Live Free or Die. But Andy has been writing games for decades and is STILL developing new creations. 
His latest game, Nevermind the Billhooks, has been very well received and comes up frequently in this podcast. Let's talk to Andy Callan about his philosophy of rule design, spanning more than three decades as a wargamer!