David Bohlke has over 30 years of experience as a teacher, teacher trainer, program director, editor, and materials writer. He has lived and worked in Japan, Korea, Singapore, Australia, Saudi Arabia, and Morocco, and has conducted multiple teacher-training workshops in Asia, the Middle East, Latin America, Africa, and the Pacific. As an editor he has worked on some of the world�s best-selling ELT courses for teens and adults. For National Geographic Learning he has authored the series Time Zones, Keynote, and Reading Explorer. David holds an M.A. in Applied Linguistics/TESOL. Paul MacIntyre earned his MA in TESL from Simmons College in Boston, Massachusetts. He has been an ELT professional for over 20 years. Paul has teaching experience in Japan and the United States, and as an editor participated in the development of numerous ELT courses for classrooms around the world. As a writer, he has contributed to various major course book and testing programs. For National Geographic Learning he is proud to have authored Reading Explorer 2, Reading Explorer 4, and most recently Pathways Listening and Speaking 4.