Graduate Students

Ojaswi Agarwal

Ojaswi graduated Summa Cum Laude from Rutgers University New Brunswick School of Engineering Materials Science Department in 2017, where he worked with Prof. Richard Haber on the imaging of spraydried alumina. Thereafter, he matriculated into the Johns Hopkins Materials Science Ph.D. track where he works with Prof. Kevin Hemker on weld properties of fused filament fabrication polycarbonate.

Research Interests: Process-property relationship, fused filament fabrication (FFF), small-scale mechanical testing, weld properties, thermal effects on local properties in FFF, additive manufacturing

Email: oagarwa1@jhu.edu


Samuel Present

Sam graduated from Lehigh University in 2016 with B.S. degrees in Materials Science & Engineering and Integrated Business & Engineering. He worked for two years in Textron’s Leadership Development Program for Engineers characterizing and performing failure analyses of metallic and composite materials and components. He joined the Hemker research group in 2018 and his research focuses on characterizes the mechanical properties of additively manufactured metallic materials.

Research Interests: Materials characterization, metallic materials, additive manufacturing, mechanical properties

Email: spresen1@jhu.edu


Katherine Brizzolara

Kate holds a M.S.E. in Materials Science and Engineering from the Johns Hopkins University (2021) and a B.S. in Physics from the University of Maryland, College Park (2019). She joined the Hemker group in the Fall of 2019. She works jointly with Naval Surface Warfare Center, Carderock Division. Her research focuses on structural ceramics.

Research Interests:Ceramic engineering, crystallography and structural determination, materials for extreme environments

Email: kbrizzo1@jhu.edu


Catherine Barrie

Catherine received her B.S. in Materials Engineering from UCLA in 2020 and joined the Hemker research group as a Ph.D. student in the Materials Science Department in the fall of 2020. Her research will support a Johns Hopkins Applied Physics Lab project focused on high temperature structural materials.

Research Interests: Structural materials, characterizing processing and property relationships, mechanical testing

Email: cbarrie2@jhu.edu


Michael Patullo

Michael graduated Magna Cum Laude from Seton Hall University with a B.S. in Physics in the fall of 2018, where he performed research on thin film solar cells with his advisor and department chair, Dr. M. Alper Sahiner. During the end of his time as an undergraduate and through the summer of 2020, he worked at H&M Analytical Services in Cream Ridge, NJ as a staff scientist. He joined the Hemker research group as a Ph.D. student in fall 2020.

Research Interests: Materials characterization, materials for extreme environments

Email: mpatull2@jhu.edu


Sharon Park

Sharon graduated from the University of Central Florida (UCF) with degrees in Mechanical Engineering (B.S. ’19) and Materials Science (M.S. ’20). While at UCF, she worked with Prof. Yongho Sohn on process optimization studies for gas atomization and selective laser melting of metallic alloys. Sharon joined the Hemker research group as a Ph.D. student in fall 2020.

Research Interests: Additive manufacturing (AM), powder metallurgy, metals, advanced characterization

Email: spark209@jhu.edu