Johnson's parents played a crucial role in fostering his intellectual curiosity and providing him with the resources and encouragement to pursue his scientific interests. His father was a civilian driver at an Air Force base and his mother was a nurse's aide.

Information regarding his marriage status and family details are not widely available to the public, maintaining a level of privacy in his personal life.

Johnson is a strong advocate for STEM (science, technology, engineering, and mathematics) education, particularly for underrepresented minority students. He frequently speaks at schools and events, inspiring young people to pursue careers in science and engineering. He actively supports initiatives aimed at promoting STEM literacy and providing opportunities for students to engage in hands-on learning experiences.

While specific details of his philanthropic endeavors are not widely publicized, it is known that Johnson actively supports various charitable causes and organizations. He is committed to using his success to make a positive impact on society.