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M. David Merrill is a leading figure in the field of educational technology and instructional design. He has been contributing to our field for about half a century. His contributions have particularly focused on instructional strategies and fundamental learning principles more than the use of educational media and their influences. He has devised a number of instructional design theories, developed technology-based instructional systems, led large-scale educational technology projects, conducted studies testing the effects of various instructional variables on different learning outcomes, and trained many researchers who have contributed to our field.