“I have to say that the AskDrCallhan DVD courses my daughter used from you were the best choice I could have made for her. Each course very well done and gave her a consistent pattern of learning a subject I would not have been able to teach her. Looking back, I would be very hesitant to homeschool high school if it were not for your curriculum as Math is my weak subject. I also appreciated Dr. Callhan answering the phone and taking time to answer all my questions in the past. Thank you so much!”

Lisa from Greenville, Wisconsin

“Thanks, Dr. Callahan, for your great Math curriculum. You were always so quick to answer when my daughter needed help. She is graduating from high school, going to Trinity University on a nice scholarship, and majoring in Economics, with a minor in Entrepreneurship. smile emoticon.”

Marian, homeschool mom

“My son took your geometry through calculus 2 courses. He just finished up undergraduate school at Hope College. He was awarded the senior prize in engineering. He will be attending the University of Illinois Champaign-Urbana in the fall for their Ph.D. program in chemical engineering. Thanks for shaping his efforts early on. He is the first of five, so we still press on with the math here at home.”


“Thank you for being a blessing all these years of homeschooling. We enjoyed and still promote your math programs as they met our children where they were (and where I was lacking) and explained concepts so very clearly and concisely.”

James from Torrington, Connecticut

“You were so very helpful with our son as he did Algebra & Geometry. Thanks much!”

Jacque from St. Paul, Wisconson

“I love your materials and recommend them to all my friends. I have used your Algebra 1, Geometry, and Algebra 2/Trig packages, and I appreciate the work you have done to choose which problems to assign, etc.”

Jarean from New Carlisle, Ohio

“Have loved using your math curriculum for high school math with my older two children.”

Teresa from Tallahassee, Florida

“We use your Algebra I, Geometry, and AlgebraII with Trig programs. I love them! Even my children who struggled with other programs are successful with your DVDs. Thank you!”

Tammy from Van Buren, Arkansas

“We enjoyed your geometry curriculum. Your video lessons that went with the math were a great help.”