Santiago López de Medrano Santiago López de Medrano Santiago López de Medrano Sánchez (born October 15, 1942 in Mexico City) is a Mexican mathematician, who works as a researcher at the National Autonomous University of Mexico (UNAM). His research has concerned knot theory, singularity theory, biomathematics, and differential topology. López de Medrano did his undergraduate studies at UNAM, and earned his Ph.D. from Princeton University in 1969, under the supervision of William Browder. He returned to UNAM as a researcher and professor in 1968, and was president of the Mexican Mathematical Society from 1969 to 1973. López de Medrano presented his work on knot
José Alfredo Peñaloza over 500 matches in Mexican Football Federation history. Mexican 1st Division Liga MX Mexican Primera A Overall Match Officiatng in FEMEXFUT: 181 Matches Officiating Peñaloza has made history to refereed the first int'l soccer tournament since FIFA issues the match official license in late 2009, he represents CONCACAF as part of six soccer confederations. CONCACAF Champions League World Cup Qualifying 2014 - Concacaf CONCACAF U-20 Championship Puebla 2013 Toulon Tournament 2014 Peñaloza has been the fourth official in the Torneo final twice occurring in the second leg, once in Torneo Clasura 2009 final between Pumas UNAM and Tuzos Pachuca and