Craig L. Johnson, Ph.D. 
Director of Operations 
Manager, TEM & FIB 
115 Bossone Research Center 
Tel: 215-895-5900 
E-mail: clj46@drexel.edu

MCC Director of Operations, Dr. Craig Johnson joined the MCC team in 2008 as the transmission electron microscopy specialist. His research background includes time working on advanced transmission electron microscopes at a CNRS lab in Toulouse, France and Brookhaven National Lab. Craig received his PhD in Chemistry from Arizona State University, where he studied defect structures in geologically important minerals using high-resolution transmission electron microscopy.

Dmitri Barbash, Ph.D. 
Senior Research Scientist 
Manager, XPS & XRD
112 Bossone Research Center 
Tel: 215-571-4611
E-mail: dvb36@drexel.edu

Dr. Dmitri Barbash joined the MCC team in 2012 to manage the X-ray photoelectron spectroscopy and X-ray diffraction instrumentation. Dmitri received his PhD from the University of New Mexico where he developed XPS and ToF-SIMS techniques for the study of pharmaceuticals. He also spent 6 years as a field-service engineer for Physical Electronics installing and servicing XPS and ToF-SIMS instrumentation across the country (including the XPS in the MCC).

Nicole Bohn
Research Instrumentation Specialist
Manager, SEM & XRM
212 Bossone Research Center
Email: neb72@drexel.edu

Nicole Bohn joined the MCC team in 2025 to manage the scanning electron microscopes and x-ray microscope (nano-CT.) She comes from a materials science background, bringing over 8 years of experience supporting similar equipment at MIT and the University of Pennsylvania, where she received her bachelor's degree. Nicole enjoys exploring the microscopic world with researchers and making it accessible to students of all ages.

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