Charles Welsh began his Anatomy & Physiology teaching career upon graduating with a B.S. in Biology from the University of Pittsburgh in 1989. He entered graduate school in 1992 and continued teaching night classes. He accepted his first full-time teaching position at Clarion University of Pennsylvania in 1996. In 1997, he completed his Ph.D. in Comparative Anatomy, Evolutionary Biology, and Ornithology at the University of Pittsburgh.

Teaching primarily in nursing and other allied health programs, he now brings his thirty years of classroom experience to the fifteenth edition of Hole's Essentials of Human Anatomy & Physiology. At Duquesne University in Pittsburgh, Pennsylvania he received several teaching awards, as well as the Mentor of the Year Award for training graduate students to teach Anatomy & Physiology. Chuck and his wife, Lori, have three children and three grandchildren. They live in the historic town of Harmony, thirty miles north of Pittsburgh, with their youngest son, where they raise chickens and have a huge garden.