4D STEM Question and Answer Session

Dr. Roberto dos Reis earned a PhD in physics from Universidade Federal do Rio Grande do Sul/Brazil and completed a postdoc at NCEM/Molecular Foundry in Berkeley, CA. He joined Northwestern University and NUANCE center in 2018 as a research assistant professor, where he contributed to collaborations and research in advanced characterization utilizing scanning transmission electron microscopy. At NUANCE, he was responsible for the introduction and adaptation of direct electron detectors (DEDs), aligning with the center's goal of employing hybrid systems and AI in EM dataset analysis. Furthermore, Dr. dos Reis played a role in implementing 4D STEM techniques with the integration of ML methods, aiming to bridge the gap between traditional microscopy techniques and modern data analysis approaches.

Dr. Jo Verbeeck co-leads the EMAT group with a diverse international population of over 80 researchers at the top of international research in electron microscopy for materials science. He became professor in electron microscopy at the University of Antwerp in 2013 and was promoted to full professor in 2018. Professor Verbeeck leads a subgroup currently consisting of seven PhD students and six postdocs. He has published over 300 papers and is regularly invited to speak at international conferences. Professor Verbeeck focuses on analytical spectroscopy, revealing the chemical and electronic structure of materials down to the atomic scale. He actively develops novel measurement setups and codes further extending the capabilities of electron microscopes.

Professor Zhen Chen earned his PhD from the Institute of Physics, Chinese Academy of Sciences, in China and completed postdoctoral work at Monash University and Cornell University. Before joining the Institute of Physics, he was an associate professor at Tsinghua University. His research interests include the development of new electron microscopy techniques, especially 4D-STEM. His group also focuses on applications of advanced microscopy techniques in functional materials. He has published more than 50 papers, including those that hold the Guinness World Record for resolution (twice).

Dr. Dieter Weber works at the Ernst Ruska Centre (ER-C) at Forschungszentrum Jülich as group leader for data and software. Activities include high-speed live and offline processing with the LiberTEM project, 4D STEM, data management, and automation. He earned a PhD in materials science at Forschungszentrum Jülich.

Dr. Cigdem Ozsoy-Keskinbora joined Thermo Fisher as an application development scientist, which led to her current role as a product marketing manager. This combined experience highlights her practical understanding of the field and its real-world applications. Her research background is extensive, with roles at Harvard University's Center for Integrated Quantum Materials, the Max Planck Institute for Intelligent Systems, and Forschungszentrum Jülich. Cigdem earned her PhD at the Max Planck Institute for Solid State Research in 2015, where she introduced hybrid electron holography.

Dr. Maria Meledina is a product manager specializing in TEM for materials science, working on Thermo Scientific Spectra Transmission Electron Microscopes and other advanced TEM techniques. With a background in complex science, she joined the Thermo Fisher R&D team in 2021, focusing on application-driven development of TEM technology. Prior to her role at Thermo Fisher, Dr. Meledina made significant contributions to the characterization and development of energy materials through advanced TEM techniques while working at RWTH Aachen University and Research Center Julich.

Dr. Lee Casalena is a senior product specialist for materials science transmission electron microscopy at Thermo Fisher Scientific. Lee brings a rich background in microscopy and materials characterization experience, including five years as a TEM field applications scientist. Lee completed his PhD in materials science and engineering at the Ohio State University with Professor Michael J. Mills. His research focused on thermo-mechanical effects of multi-element additions to high-temperature shape memory alloy systems, with a focus on structural and chemical characterization of novel secondary phases and defect formations using TEM, including electron tomography and 4D-STEM. He has contributed multiple publications on these topics and received several awards for his research, including a presidential fellowship. He is currently based out of Portland, Oregon.

Dr. Xi Chen is an application scientist at Thermo Fisher’s Hillsboro NanoPort. She has six years of experience in transmission electron microscopy with a background in materials science. She earned her PhD in James LeBeau’s group at the Massachusetts Institute of Technology.