Sebastián Martínez (she/her) is a Law Student in Guatemala with two years of experience in LGBTI strategic litigation, advocacy and activism. She's passionate about International Human Rights Law and Public International Law, and is particularly interested in the topics of the application of the conventionality control and the use of constitutional principles as means to secure LGBTI protections. 

She is currently part of the board of the organization Visibles, where she has worked as a legal consultant, has delivered educational workshops on LGBTI topics and is currently leading efforts to build a cohort of youth focused civil society organizations to advance civil rights in Guatemala. She's also a part of Red Trans Joven, a local trans led organization, as their main legal advisor and board member. 

She has been a part of several Moot Court Competitions, both as a competitor and as team coach, including the Philip C. Jessup International Law Moot Court Competition editions of 2022 and the ongoing edition of 2023.