John F. O’Sullivan is a Librarian, an Assistive Technology Specialist and an author of several books on educational technology. His books include UDL Technology, TheTeacher’s Awesome App Guide, and Teaching Projects with Computers. He currently holds four certifications in education and has taught under each certification. He works for Chelmsford Public Schools at Chelmsford High School. He has worked in the past as a Special Education Teacher and Technology Integration Specialist. His twitter account is @The_app_guide. He catalogs educational and assistive technology on his websitehttp://www.teachertech.net/