Professor
Zachry Department of Civil & Environmental Engineering
Department of Materials Science and Engineering
Jeff Bullard joined Texas A&M as a Professor in August 2019, holding joint appointments in the Zachry Department of Civil and Environmental Engineering and in the Department of Materials Science and Engineering. Prior to that, Dr. Bullard was a Materials Research Engineer at the National Institute of Standards and Technology. His research involves applying the principles of thermodynamics and kinetics to understand, predict, and ultimately control the evolution of microstructure and properties of materials.
Yoonjung Han joined the group in January 2020 and received her PhD in May 2025. Her work has been focused primarily on fundamental experimental characterization of pozzolanic reactions in cementitious binders. Before coming to Texas A&M, Yoonjung worked in a research center for two years, where she investigated lightweight concrete in addition to continuing her investigations of fiber-reinforced concrete and light-transmitting concrete that were the subject of her M.S. research at Seoul National University of Science and Technology. Yoonjung plans to accept a postdoctoral research associateship with Professor Shiho Kawashima at Columbia University in Fall 2025.
Florin joined the group in February 2024 working on developing and validating computer models for 
Prior to this appointment, Dr. Hossain was a postdoctoral researcher on ceramic additive manufacturing at Luleå University of Technology, Sweden and Korea Institute of Materials Science (KIMS), South Korea. He has PhD, Masters, and Bachelor degrees all in ceramic engineering and has worked with ceramic materials for more than eight years. His PhD studies focused on waste-derived ceramics, either for low-density materials or for high temperature applications. During his Masters, he synthesized magnetic-dielectric compounds by the sol-gel auto combustion method and analyzed their magnetic-dielectric properties. His main research expertise lies in ceramic processing, including the use of high-end characterization methods to analyze thermal transformations and microstructures so as to ultimately correlate performance with raw materials and processing.
Theresa McEnroe joined the group in 2023 during her final year of her undergraduate degree at Texas A&M. She graduated with a bachelor’s degree in Materials Science and Engineering and is continuing in this field to pursue her PhD. She is currently researching the rheological properties of Ultra-High-Performance Concrete (UHPC) for applications to additive manufacturing. She is also working on the effects of synthetic and natural zeolites as an additive in cements. Terry has a strong interest in materials with extraterrestrial applications, has applied to NASA’s astronaut program, and hopes to pursue a career in space research.
Meihe Zhang is an undergraduate student in Materials Science and Engineering at Texas A&M University. She studied for two years at Sichuan University in China before transferring to Texas A&M. She joined Dr. Bullard’s group in Summer 2025, where she assists with different research projects, primarily in-situ characterization of nanoscale dissolution of materials, where she works closely with Yoonjung Han. Her work involves techniques such as microthermogravimetry (μ-TG) and digital holographic microscopy (DHM). Outside of academics, Meihe enjoys playing piano and doing photography with friends. She plans to pursue a PhD in materials science and continue her research on materials and reaction kinetics.
Natasha Van Dam joined the group as an undergraduate research assistant in September 2022. She is currently working on characterizing the rheological properties of fresh Ultra-High Performance Concrete for additive manufacturing and assists in other projects. She is studying civil engineering at Texas A&M University and plans to graduate in May 2024. A
Nai Keng Wang is from a Taiwanese family with two parents and one younger sister. He received his bachelor’s degree in Materials Science and Engineering at National Taipei University of Technology in 2020. Afterward, he worked at a technology company for approximately 2 years, where he conducted research on enhancing the thermal conductivity of copper and graphene composites. His PhD research is focused on sintering of ceramics and extraterrestrial materials in particular. Outside of research and school work, Nai Keng likes hiking, traveling, cycling, and learning English.