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Sebastian Roessler is a seasoned mathematics educator with extensive experience in teaching and curriculum coordination. Currently serving as a Professor of Mathematics at The Grange School Chile since July 2016, Sebastian specializes in IGCSE and A level programs. In addition, Sebastian has been involved in SAT Math training with SER since February 2010, focusing on course preparation and skills development. Previously, Sebastian held the position of National Plan Math Coordinator at The International School Nido de Aguilas, overseeing K-12 mathematics and teaching the IB diploma program from February 2010 to January 2016. Sebastian's earlier role as a Mathematics Teacher at Southern Cross School from January 2004 to February 2010 included responsibilities related to the national PSU program. Sebastian holds a degree in Didactics in Mathematics from Pontificia Universidad Católica de Chile.