Arek Dreyer has been an Apple Certified Trainer since 2002. Originally an expert in Sun systems, Arek shifted his professional focus to Mac OS X shortly after it came out. President of Dreyer Network Consultants Inc., Dreyer has been delivering courses and providing training around the world, both in the classroom and at events like Channel Camp and the Macworld Conference and Expo. Dreyer also provides integration and troubleshooting services for his own customers and for Apple. Along with Ben Greisler, he authored Apple Training Series: Mac OS X Server Essentials v10.6. nbsp; Ben Greisler is the owner and technical lead of Kadimac Corp, a firm specializing in the integration of OS X and… the Macintosh into business IT. Greisler is an Apple Certified Trainer, author, consultant, and lecturer who has been on the Advisory Council of the Apple Consultants Network and the MacIT Committee of the Macworld Expo.