Oscar Martínez resides in Oak Park (Chicago), Illinois. Through the study of science and art at the University of Illinois at Champaign, in 1977, he received a Bachelor of Science in Medical Art from the University of Illinois Medical Center. Mr. Martínez is an accomplished artist who has had numerous group and solo exhibitions throughout the Caribbean, Mexico, and the South Eastern and Midwest regions of the U.S. Among his many credits, his work has been shown in the Museum of Bellas Artes and the National Historical Museum in Mexico, the Desplaines Museum in Illinois, NIU Museum’s Gallery in Chicago, the Art Museum of Puerto Rico, the Field Museum of Chicago, the State of Illinois Museum in Springfield and its gallery in Chicago at the State of Illinois Building. Additionally, his work has been featured on various television shows and published in newspapers and magazines.

Martínez was actively involved in the Chicago mural movement and has painted numeous murals throughout out the city. In addition, he has been commission to create public art for the City of Chicago and the University of Illinois. Moreover, he was appointed by the Mayor of Chicago to judge the international Design/Build competition for the Chicago Public Library and the selection of the library's art collection. He was also appointed by the Governor of the State of Illinois to the Illinois Arts Council where he served as chair of Media Arts. Furthermore, he has served on various boards and commissions including as President of the Latino Institute of Chicago. In 2005, he did an Artist in Residency at the University of Illinois at Champaign. He is currently Artist in Residence at the Chicago Grammar School.