*Jill Adler*

Jill Adler holds the SARChI Mathematics Education Chair at the University of the Witwatersrand, which focuses on research and development in secondary mathematics education, and is the 2017-2020 President of the International Commission on Mathematical Instruction (ICMI). Jill has spearheaded several large-scale teacher development projects, the most recent, within the Chair ambit, begun in 2009, is called the Wits Maths Connect Secondary project. This work builds on her research on teaching in multilingual classrooms, and teacher professional development. Jill is a Visiting Professor of Mathematics Education at King’s College London, UK. She is the recipient of numerous awards, the most significant of which are the 2012 Academy of Science of South Africa (ASSAf) Gold Medal for Science in the Service of Society, and the 2015 Freudenthal Award.

*Mahaman**Bazanfar**é*

Mahaman Bazanfaré has been teaching Mathematics at Université de Niamey since 1995 while working at various administrative positions: Deputy Head of Mathematic Department at Université de Niamey from 1999 to 2003; Technical advisor at the office of the Vice Chancellor Université de Niamey from 2008 to 2011;Member of Université de Niamey Scientific Counsel from 2011 to 2017;Vice President of Université de Niamey Scientific Counsel from 2011 to 2013; General Secretary at the Ministry of Higher Education (Niger Republic) from May, 2012 to September, 2013; Director of the Cabinet of the Minister of Secondary Education (Niger Republic) from September, 2013 to April, 2015;Rector (Vice Chancellor) Université de Zinder from April, 2015 to the present; Prof. Mahaman is member of various networks of research in Mathematics. He is currently the Vice-President of Research and Innovation Commission of the African Mathematical Association. In terms of publications and students’ supervision, Prof. Mahaman is author of many peer-reviewed articles in Mathematics and has supervised many Master’s and Ph.D theses.

*Bernardo Rodrigues*

Bernardo Rodrigues was born in the city of Malanje, North of Angola and studied at the Pedagogic University Enrique José Varona in Cuba where he earned the Graduate in Mathematics and Education in 1991. In 1991, he was appointed as a junior lecturer to the Mathematics Department at Universidade Agostinho Neto, Luanda, and in 2004 became a senior lecturer. In 1996 he moved to South Africa, where at the former University of Natal, in Pietermaritzburg he obtained an Honours degree in pure Mathematics (1997), an MSc in Mathematics (theory of group extensions) in 1999 and a PhD in Mathematics (Algebraic Coding Theory) in 2002, the latter under the supervision of Jamshid Moori (Natal) and co-supervision of Jennifer Key (Clemson University, USA). He was appointed to the Mathematics Department of Natal University in 2004, where he became an Associate Professor since 2010, under the new merged University of KwaZulu-Natal. In the period 1996 – 2002 he was awarded a DAAD-German Academic Exchange Scholarship and the Angolan Ministry of Petroleum to take up graduate studies, and in 2017, he was the recipient of a Fulbright Scholar Award. During the period 2016 – 2018 he was awarded two scholarships by the European Union to participate in two Erasmus Mundus Plus Exchange Programmes for scholars. He was also one of three African recipients of the Mentoring African Research in Mathematics programme under the auspices of the London Mathematical Society to take up a partnership with the University of Birmingham (UK). Most recently he was awarded a research fellowship by the Isaac Newton Institute (Cambridge University) to undertake research on problems relating representation theory of finite groups and classification (February to June 2020).

Although his early work concerned the theory of finite groups, in particular the study of the extension problem, his current research interests concern with the inter- play between Algebraic Coding Theory, Finite Simple Groups, Modular Representation Theory of Finite Groups and Combinatorial Design Theory as well as Computational Group Theory and Axial Algebras, including both the concrete and the abstract aspects of these subjects. His recent papers involve modular representation of finite simple groups, by examining problems relating the realization of finite simple groups as permutation groups of automorphisms of linear codes. He also works on problems related with the construction of non-associative axial algebras related to the sporadic simple groups and on applications of graph theory to the transmission of diseases and other societal problems using network models. He became the managing editor of the journal Afrika Mathematika in 2013 and one of three Deputy-Editors since 2018. He has held several visiting positions in several African countries, at universities in Europe, the United States, Australia, New Zealand and most frequently at the University of Birmingham in the United Kingdom. He is an invited professor of the Mathematics Department at Universidade Agostinho Neto in Luanda since 2008.

* Andrés Fraguela Collar *

Was born in Havana-Cuba in 1950 and has a degree in Mathematics since 1972 at the Havana University, where he also defended the Master’s degree in 1974. He defended the PhD in Mathematical Physics at Moscow M.V. Lomonosov University in 1980 and later in 1991 the Doctorate of State in Sciences, in collaboration with the Steklov Mathematics Institute of the Academy of Sciences of the former Soviet Union, where he was also a scientific collaborator for two years. He was vice president of the Cuban Society of Mathematics and Computation, member of the Higher Scientific Council of the Cuban Academy of Sciences, advisor to the Ministry of Education of Cuba, Professor of the Faculty of Mathematics of the Havana University, Adjoint Professor of the Havana Polytechnic Institute, of the Havana Pedagogical Institute and of the Faculty of Mathematics and Mechanics in the M.V. Lomonosov Moscow State University, Associate Professor of the International Center of Theoretical Physics (ICTP) in Trieste-Italy and Head of Department in the Institute of Cybernetics, Mathematics and Physics of the Cuban Academy of Sciences.

Since 1992 and to date, he has been a Research Professor at the Faculty of Physics and Mathematics of the Autonomous University of Puebla in Mexico and member of the National System of Researchers of Mexico. He is a specialist in Differential Equations, Mathematical Modeling, Mathematical Physics and Teaching of Mathematics and has taught at the undergraduate level and postgraduate students of Mathematics, Physics, Computing, Pedagogy, Administration, Biology, Engineering and Environmental Sciences. He has developed fundamental research in the branches of Approximation Theory, Functional Analysis, Optimization, Partial Differential Equations, Spectral Theory of Differential Operators, Inverse Problems and Teaching of Mathematics. In the latter, he has created a Integarl Teacher Training Program (PIFMA) which proposes a methodology to train teachers and for student learning based on the development of mathematical logical thinking and the capacities of abstraction and generalization, as well as the use of Mathematics to solve practical problems.

* Nouzha EL YACOUBI *

Professor Nouzha EL YACOUBI has been elected President of the African Mathematical Union (AMU) for the period 2017-2021 by the AMU General Assembly held in July 2, 2017, in The Sciences faculty, University Mohammed V, Rabat, Morocco, in the framework of the 9th edition of the Pan African Congress of Mathematicians (PACOM 2017, July 3-7, 2017). **She is then the first African women mathematician to hold such prestigious position. **She was the AMU Vice – President (for North Africa) during the period 2013-2017, the AMU Secretary General (2004-2009) and the Chairperson of the AMU Commission on Pan African Mathematics Olympiads AMUPAMOC during the period 1995-2009. Since 2013, at present she is the AMMSI Regional Coordinator (for North Africa). She is member of several international organisations (CIMPA, OWSD, etc…) She has been involved in many reports on the mathematics development in Africa, for example in “Mathematics Opportunities and Challenges in Africa” elaborated upon the request of the John Templeton Foundation in (2009), in the International Mathematical Union Report on Mathematics development in Africa (MENAO, ICM 2014) etc…As for her scientific profile, she defended with success her State Doctorate (PHD) in 1995, in Pure Mathematics (Non associative Topological Algebras). She visited many universities through the world, as invited researcher, speaker, plenary lecturer, key note speaker etc…in particular, she contributed in many Dissertations Jury through Africa as member, reporter or President of the Jury.

Since 2008, she has been interested by Mathematics Education, so she has contributed as member of an UNISA Project on Professional Development of Mathematics Teachers (2012) with a published paper; panelist in a Plenary Panel in ICME 2012 In Seoul, South Korea; panelist in the Second African Forum on Science Technology and Innovation (STI), Rabat, Morocco (2014); Keynote Speaker in the 7^{th} Science Mathematics and Technology Education SMTE (2015) In Sultanate of Oman; Invited speaker for ICME 2016 in Hamburg, Germany; panelist at the IMU Commission for Developing Countries (CDC) Panel (2018) at Rio the Janeiro, Brazil, organized during the International Congress of Mathematicians (ICM 2018).

**Maria Teresa Bixirão Neto**

Maria Teresa Bixirão Neto is a professor in the Department of Education and Psychology and a member of the Centre for Research in Didactics and Technology in Training of Trainers (CIDTFF) at the University of Aveiro. Her main research interest is the teaching of secondary mathematics. She has collaborated in several large-scale teacher development projects, including the Project for Curricular Restructuring of Secondary Education in East Timor (ET) (2013-2015), coordinating and co-developing programs, students’ books and teachers’ guides; as well as a project in São Tomé and Príncipe, conducting training of secondary school teachers in the area of Geometry (2015-2017). This work has been based on research on issues related to curriculum development and the professional development of teachers of Mathematics. She has also made several scientific stays at the University of Granada, in the Department of Mathematics, collaborating in the development of research in the field of Onto-Semiotic Approach to Knowledge and competences of Mathematics Teachers.

*Lew Hee-chan*

Professor Lew Hee-Chan is the 10th President of Korea National University of Education from 2015.Raised in Seoul, He received his Bachelor’s Degree (B.S.) in Math Education (1980), and his Master’s Degree (M.Ed) in Math Education (1983) from Seoul National University. After graduation from Seoul National University, he received Doctoral Degree (Ed.D) from Temple University in Philadelphia in 1989. He began his career as a professor at Korea National University of Education in 1991, and then he served as the Director of the Education Research Institute (2006-2008) and Dean of Planning (2008-2010) in KNUE.

He owned numerous professional memberships including International Committee member of International Group for the Psychology of Mathematics Education [PME] (2003-2007), Chairperson of 10th Asian Technology Conference in Mathematics [ATCM] (2004 -2005), Joint Chairperson and International Program Committee (IPC) member of The 12th International Congress on Mathematical Education [ICME-12] (2008-2012), and IPC member of [ICME-13] (2012 – Present). He served as the Chairperson of The Korean Society of Educational Studies in Mathematics [KSESM] (2010-2012) and took the honorary Chairman of The Korean Society of Educational Studies in Mathematics [KSESM] (2012-Present).

**ADOLPHE COSSI ADIHOU**

Adolphe Cossi Adihou is a the current President of the Association of African

Didacticians of Mathematics, for which he has been one of the creation initiators. He is a founding member of the International Observatory of Algebraic Thought (OIPA). He has been awarded by the Quebec Mathematical Association (QMA)

prestigious Prize, for the teaching and learning of mathematics for teachers and orthopedagogues. A decade ago, he contributed efficiently in the launching of the studies on training and Mathematics didactics research at the Institute of Mathematics and Physical Science (IMSP) in Benin.

Since January 2011, he has been Associate Professor of Mathematics Didactics at the Department of Studies on School and Social Adaptation, at the Faculty of Education, University of Sherbrooke, Quebec. He contributed as a mathematics didactics teacher at the Department of Education, University of Quebec at Rimouski from 2003 to 2010. He is holder of a Master’s degree in Mathematics, and a PhD in Matematics Didactics from the University of Geneva. He completed his training with a postdoctoral internship in the Department of Mathematics at the University of Quebec, in Montreal, under the direction of Professor Carolyn Kieran.

His contribution to research in mathematics didactics was constant and supported by his publications and his involvement in several professional and scholarly associations amoung them: Francophone Mathematical Space(EMF), International Observatory of Algebraic Thought (OIPA), the Quebec Mathematical Association (QMA), the Association of African Didacticians of Mathematics ADiMA, etc… .

Professor Adihou conducted many funded and non-funded research projects. His research was motivaded by his concerns in teaching, and teacher initial and continuing training. His research focuses on didactic phenomena in teaching and learning mathematics in general and in particular the development of algebraic thought in primary and secondary levels. He is also interested in the difficulties of teaching and learning mathematical concepts. He participated in the design of didactic resources through several collaborations and partnerships. His interests also include the use of mathematical tricks in teaching and learning, the analysis of teacher training systems in mathematics, and the issues related to the initial and in-service training of teachers and mathematics orthopedagogues.