She is the founder and director of the publishing house Ediciones Letra Muerta, based in Caracas, Venezuela.

[3] Ex Libris has won the contest of 'Best Book design From all over the World' (Leipzig, Germany) on three occasions.

Based on comprehensive research focused on the poetic work of the Venezuelan writer Miyó Vestrini, Mereb assembled and designed two books, Es una buena máquina and Al Filo, both by Vestrini, in which she collected her literary interviews and unpublished poems.

[1][3][4] Es una buena máquina was selected in the Ibero American Design Biennial of Madrid and in the Feria Iberoamericana de Arte (FIA) of 2015.

In 2014, she co-founded Ediciones Letra Muerta, a publishing house dedicated to cover relevant Venezuelan authors like Vestrini and Ida Gramcko, among others.