Martijn Tel

HMH Supplemental Publishers, Inc. provides core and supplemental educational materials and instruction programs to the K-12 and adult markets. The firm operates through its Rigby (reading and comprehension), Saxon (math, phonics, and early learning), and Steck-Vaughn (vocabulary, fluency, phonics, and test preparation) imprints. The company operates as part of Reed Elsevier's global Harcourt Education division. It was founded by Gabriele Madison, Julie A. McGee, Henry Z. Horbaczewski, Timothy J. McEwen, Martijn Tel, Kenneth E. Fogarty on September 11, 1992 and is headquartered in Orlando, FL.

Part of RELX Plc, Elsevier Science, Inc. is a leading health education platform based in New York, NY. Osmosis.org, a subsidiary of Elsevier Science, empowers millions of current and future clinicians and caregivers with the best learning experience possible. Osmosis pioneers in medical education technology by offering online educational video content that's simple, engaging, and informative. The platform has a library of over 1,600+ videos covering pathology, physiology, pharmacology, and clinical practice, complete with questions, flashcards, and notes. Osmosis has an engaged audience of more than one million active learners and a YouTube channel with over 1.8 million learners worldwide.

Archipelago Learning, Inc. provides software solutions and online programs for students and educators. The company was founded by Cameron Chalmers and David Muzzo in 2000 and is headquartered in Bloomington, MN.

Classroom Connect, Inc. provides professional development programs and online instructional materials for K-12 education. The firm helps teachers to become better teachers by engaging them in their own learning and inspiring positive change in the classroom. The company was founded in 1994 and is headquartered in Brisbane, CA

Medical Media Holdings LLC operates as a holding company with interests in medical education. It also provides oncology education services including conferencing and publications. The company was founded in 1996 and is headquartered in Columbia, MD.

Harcourt, Inc. provided educational services to readers of all ages. It offered a variety of books, print, electronic learning materials, assessments, and professional development programs. The company was headquartered in Orlando, FL.

SiriusDecisions, Inc. provides business to business research and advisory services. It offers consulting, proprietary assessment tools and access to network of sales and marketing practitioners. It provides executive advisory, benchmarking assessment and management consulting services. The company was founded by Richard E. Eldh Jr. and John J. Nesson in 2001 and is headquartered in Wilton, CT.

Gerson Lehrman Group, Inc. provides membership network for learning and expertise. The firm promotes knowledge exchange through conversations, small group convenings, mentorships, surveys, and other interactions with its network of experts. The company was founded by Alexander Saint-Amand, Thomas D. Lehrman, and Mark Gerson in 1998 and is headquartered in New York, NY.