We are excited to share the news that NETZSCH Instruments NA is hosting the 35th International Thermal Conductivity Conference (ITCC) and the 23rd International Thermal Expansion Symposium (ITES)! The events will take place from September 26 to September 29, 2021 in Boston, Massachusetts, USA. This premier conference series has a long history, and has served as an excellent forum for engineers, researchers, and program/project managers from industry, academia, and government labs to exchange and share the latest results in research and development. This conference will feature thermal conductivity and thermal expansion topics, as well as all thermophysical properties for materials, techniques, and applications Our mission is to provide a forum for the free exchange of ideas, advancement of the science, training of new professionals, and discussions of the state-of-the-art in thermophysics. The proceedings are published in hard cover format following the conference and a rigorous peer review.