Rosario was born to Atty. Eduardo Gutierrez Rosario of Pangasinan and Anita Alvarez De Rivera of Aparri, Cagayan. He is the fourth of thirteen siblings.[2]
Rosario was appointed senior assistant city prosecutor in Quezon City in 1994, where he served for three years. Rosario became the presiding judge of Manila Metropolitan Trial Court Branch 19 in 1997, then later as presiding judge of the Makati Regional Trial Court Branch 66 until he was promoted to the Court of Appeals in September 2005.[4]
Rosario was Chairman of The Court of Appeals' Ninth Division. He held the position for 15 years until his appointment to the Supreme Court in 2020.
Associate justice of the Supreme Court
On October 8, 2020, President Rodrigo Duterte appointed Rosario Associate Justice of the Supreme Court.[5] Rosario filled the post vacated by Supreme Court Associate Justice Jose Reyes Jr., who had retired that September.[6] He was chosen out of six other potential candidates, Court of Appeals (CA) Associate Justices Ramón Cruz, Japar Dimaampao, Jhosep López, Eduardo Peralta Jr., and María Filomena Singh, as well as Court Administrator Midas Márquez.[7]
Personal life
Rosario is married to Maridur Virtucio-Rosario,[2] deputy commissioner for operations of the Bureau of Internal Revenue since October 2023.[8] They have three children.[2]