Charles Reigeluth is a professional in their field. They is proficient in Spanish. Colleagues describe them as "Charlie's expert knowledge in the field of instructional theory and instructional design theory, provides much insight into the pedagogical underpinnings, (foundation work) on which the principles of the Instructional Design field rests." and "I have been working with Dr. Reigeluth since 2008. He was my adviser and dissertation committee chair during my Ph.D. program in Instructional Systems Technology department. Without his guidance and support, I would not have completed my program in such a short time. He provided timely constructive feedback for my continuous growth and improvement. He has been an amazing mentor and friend during this challenging journey. Everything between Dr.Reigeluth and me started with an idea of making education upside down. I have been always amazed at his ideas about systemic change, schooling, learner-centered education, and his wonderful books. I wish that every Ph.D. student in this field had a chance to work with him! That was truly a life-changing experience for me."