Yeap Ban Har
Yeap Ban Har, Ph.D., was a faculty member at the National Institute of Education Singapore at Nanyang Technological University. Since then he has held concurrent positions as principal of a teacher professional development institute, director of curriculum and professional development at the Pathlight School in Singapore and the Anglo Singapore International School in Thailand. His research interests include problem posing and solving, challenging all students, and teacher professional development.

Marianne Nolte
Prof. Dr. Marianne Nolte trained students of elementary and middle school as well as special education in the field of mathematics didactics for elementary school at the University of Hamburg until her retirement at the end of September 2019. Her experiences as teacher at school dealing with heterogeneous learning provided important impulses for her research at the university. She worked as a dyscalculia therapist and developed a master’s program for prospective learning therapists at the University of Hamburg.

During her time as a teacher, she also taught particularly gifted children. The encounter with Prof. Dr. Karl Kießwetter and the desideratum of offers in the primary school sector motivated her to develop a research and support project on special mathematical giftedness. PriMa (Kinder der Primarstufe auf verschiedenen Wegen zur Mathematik) is now a cooperative measure between the Hamburg Authority for Schools and Vocational Training (BSB), the Faculty of Education at the University of Hamburg, and the William Stern Society Hamburg, which celebrated its 20th anniversary in August 2019. Because of the success of the measure a further project PriSMa continues research and fostering for students from 5^th to 10^th grade.

Karl Schaffer and Erik Stern co-direct MoveSpeakSpin, the non-profit umbrella for the Dr. Schaffer and Mr. Stern Dance Ensemble, which toured internationally for over 25 years. Karl and Erik are on the Teaching Artist Roster of the Kennedy Center for the Performing Arts for their work integrating dance and mathematics on stage and in the classroom. Their California-based company has received five grants from the U.S. National Endowment for the Arts, and their collaborative and individual interdisciplinary work includes a book, Math Dance, and numerous articles, workshops, presentations – and performances.

Erik Stern
Erik Stern (BS Biology, UC Santa Cruz, MFA Dance, CalArts) has choreographed over sixty works for professionals and students. His evening-length work Demolition Derby, when a mind loses its license to drive addressed the issue of caring for parents with dementia, and forged a consortium linking faculty, students and staff with researchers, healthcare, arts and caregiver organizations, concluding with a tour to New York City. Erik danced with Tandy Beal & Company for 10 years, and has appeared as a guest artist with Repertory Dance Theatre and other groups. In November 2021, Erik will be a visiting fellow at the University of Bologna’s Institute of Advanced Study, where he will share recent publications and scholarship related to Pattern Play, an innovative college mathematics and movement course he co-designed.

Karl Schaffer
Karl Schaffer is a dancer/choreographer and mathematician whose recent dance concerts include Nevertheless She Persisted: The Daughters of Hypatia, on the lives, work, and struggles of women mathematicians; Mosaic, on issues of culture, conflict, peace and justice in the Mideast; Choreocopia, a festival of food, song and dance; and Pitter Pattern, exploring beautiful and enchanting patterns in dance, rhythm, and shape. He has published over 20 papers on dance and math, one of which appeared in The Best Writing on Mathematics 2012. He was a Mellon Creative Resident artist at the Tri-Colleges in Pennsylvania, holds a Ph.D. in mathematics from the Univ. of California Santa Cruz, and is an emeritus professor at De Anza College, where he has integrated movement and dance activities in his math classes for many years.

Zalman Usiskin - The Road from Ordinary to Extraordinary
Zalman Usiskin is a professor emeritus of education at the University of Chicago, where he was a faculty member and director of the University of Chicago School Mathematics Project (UCSMP). His research has focused on the teaching and learning of arithmetic, algebra, and geometry, with particular attention to applications of mathematics at all levels. He is the author or co-author of over 150 articles and dozens of books and book-length research monographs and has served on the Mathematical Sciences Education Board of the National Research Council, the Board of Directors of the National Council of Teachers of Mathematics (NCTM), and the United States National Commission on Mathematics Instruction. He is well-known as a speaker in the U.S. and abroad and has spoken at conferences or colloquia in all 50 U.S. states and 25 foreign countries about a variety of topics, matching his broad interests in mathematics education. He has received the Glenn Gilbert (now the Glenn Gilbert/Ross Taylor National Leadership) Award from the National Council of Supervisors of Mathematics and Lifetime Achievement Awards from NCTM and the International Society for Design and Development in Education.