 Vallejos-Marchant was born and raised in Santiago, Chile and received her degree in Marine Biology from the University of Valparaiso followed by a Masters in Conservation of Natural Resources.Vallejos-Marchant is the Head of the Projects and Environment Department at the Chilean Antarctic Institute (INACH) and a member of the Committee for Environmental Protection (CEP).She first travelled to Antarctica in 1995  and has visited 10 times subsequently.