Sebastián was born in San Francisco de Mostazal, a little town located 40 km south from Santiago. He studied to become an agricultural technician, he is currently married, and has two daughters: Martina and Nicole. He has worked as assistant oenologist at Horcher Vineyards, and also as viticulturist at the Pfalz valley in Germany. In addition, he also worked as a general manager at Agrícola Esperanza, Rancagua, and at other companies related to the wine industry. Sebastián is passionate about outdoor sports such as mountain biking, trekking, and horse riding.