Janice Aspelin Schwegler, who finished the illustrations in the first four units, is a certified medical illustrator in Long Beach, California. She received her education and certification as a medical illustrator from the Medical College of Georgia. She has contributed many anatomic illustrations to medical textbooks and other publications. Ms. Schwegler worked as a show designer on Ride Through the Human Body with Frank Armitage at Walt Disney Imagineering. She has been featured in many art shows and illustrated many books.