Dr. Jillian Holtzmann (also known as Holtz and Holtzy) is Ph.D specializing in experimental particle physics, is a former associate professor from the Kenneth P. Higgins Institute, and is a founder of the Ghostbusters in the 2016 movie, along with Doctors Abigail Yates and Erin Gilbert. Utilizing nuclear engineering, she designed and built their equipment, including the Proton Packs and Sidearms.