Simeon Ball is senior lecturer at the Department of Mathematics of the Universitat Politècnica de Catalunya in Barcelona. He has been invited speaker at many international conferences, as well as serving on the scientific and organising committee for many conferences. His research interests include classical and quantum error-correcting codes, incidence problems in real and finite geometries, graphs and semifields, and is particularly focused on applying geometrical and algebraic methods to these combinatorial objects. He has published more than 70 research papers and two books and serves on the editorial board of the Journal of Geometry and the Journal of Combinatorial Theory Series A, having previously served on the editorial board of Designs, Codes and Cryptography and Finite Fields and Their Applications. ​Oriol Serra is full professor at the Department of Mathematics of the Universitat Politècnica de Catalunya in Barcelona. His research interestsare in combinatorics, graph theory and combinatorial number theory. He has been particularly interested in isoperimetric problems, Ramsey Theory, extremal and probabilistic combinatorics and additive combinatorics. He has published more than   100 research and divulgation papers, has been invited speaker in key conferences and has been involved in the organization of several of them. He has been involved in teaching Combinatorics and Graph Theory at undergraduate and master levels, particularly in a successful course on the topic jointly with Prof. Simeon Ball. He has served as chair of the department of mathematics, vicedean of research of the School of Mathematics at UPC and member of the Executive Committee of the Barcelona Graduate School of Mathematics among other duties.