Lex Marcos is from Manila, Philippines. He studied Painting and Art History at the University of the Philippines, Diliman. After taking a course in scenic design with Amiel Leornadia, Lex was given the opportunity to design his first realized production, Machiavelli's The Mandrake. As a newly fledged practicing designer, he worked with a Japanese lighting designer, Naomi "Shoko" Matsumoto, who invited him to join her lighting workshop, Awareness of Light. Matsumoto mentored him in creating sets which focussed specifically on lighting as a primary element of set design. Lex then went on to collaborate with Matsumoto in a Broadway premiere of Next to Normal in Manila. He designed sets in Manila for eight years, working with acclaimed Filipino directors, designers, visual artists, and playwrights. A turning point came when Lex assisted David Gallo who visited Manila to design the Manila premiere of Nine the Musical. Gallo, together with University of Washington School of Drama Professer Tom Lynch and NYU Tisch School of the Arts Design Chair Susan Hilferty, all made it possible for Lex to journey to the United States to join the MFA Program at the University of Washington, School of Drama. He recently finished his MFA in Scenic Design March 2017,
His works Ang Post Office ng Hari and Umaaraw Umuulan KInakasal Ang Tikbalang have been selected for Philippines exhibit in the Prague Quadrennial of Performance Design and Space in 2011 and 2015.