Dr. Johnson is a subject matter expert who developed study lessons for Study.com. He provided various types of content for different levels of learners but primarily in higher education. Dr. Johnson’s associates also provide K-12 lessons in the areas of English, Language, Arts, and certain Sciences. For learners who have somewhat of a difficult time in certain subject areas, the content on Study.com allows you to be able to review subjects in small amounts to first understand the fundamentals. You may visit Study.com for more information.