| DEPARTMENT | NAME | EXTENSION | 
| Academic and Innovation Office | Jimena Jaime | 134 | 
| Academic and Rector’s Office Secretariat | Mayerli Vargas | 200 | 
| Administrative Office | Nicolás de Brigard | 107 | 
| Admissions | Juliana Molina | 109 | 
| Billing and Collections | Mónica Lobo | 231 | 
| Cafeteria |  | 118 | 
| Communications Office | Carolina Vargas | 250 | 
| Elementary School Principal | Paula Camacho | 121 | 
| Extracurricular Activities |  | 230 | 
| Formation and School Life Office | Carolina Travecedo | 241 | 
| IT Support (email, Mi GLM app, etc.) |  | 238, 239 and 251 | 
| Learning Support Center (KOA) | Ana María Duarte | 199 | 
| Middle School Principal | César Rojas | 140 | 
| Nursing |  | 177 | 
| Parents’ Association – ASOMONTAÑA | Diana Sanabria | 214 | 
| Preschool Principal | Juana Cajiao | 143 | 
| Transportation | Paola Sepúlveda | 228 | 
| Upper School Principal | Olga Lucía Cabrera | 235 | 
| Vice Principal of Middle and Upper School | Leopoldo García | 222 |