Prof. Bernard Teissier is a world-renowned mathematician who works in the field of algebraic geometry, singularity theory and commutative algebra. Prof. Teissier is a guest of the program "Increasing research capacity in the field of mathematical sciences" (PIKOM) of the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences (IMI–BAS) and the International Center for Mathematical Sciences - Sofia (ICMS-Sofia).