In honor of Finnish educational science professor Erno Lehtinen’s lifetime accomplishments and enthusiasm in educational research, the ELOC presents a series of open online lectures given by world-leading experts on a variety of topics related to mathematics learning and instruction, expertise development, socio-cultural aspects of learning, educational technology, self-regulation, motivation, and research methodology. Special emphasis of the research colloquium is on novel approaches, recent findings, and exciting insights of future development in the fields of learning and instruction. The ELOC is organized by Mathematical Learning Research Group, Department of Teacher Education in University of Turku, Finland.