The story about the true origin of the city's name, 'Las Piñas', varies. Las Piñas became one of the municipalities making up the region. 824, Las Piñas was excised from the province of Rizal to form Metro Manila. On November 7, 1975, through Presidential Decree No. The town was occupied by the Japanese during World War II and liberated by the combined American and Filipino forces. It was separated from Parañaque to become an independent municipality again on March 27, 1907, by virtue of Philippine Commission Act No. 942, it was combined with the town of Parañaque, with the latter as the seat of a new municipal government. On October 12, 1903, in accordance with Act No. In 1901, the municipality of Las Piñas, previously a part of the province of Manila, was incorporated to the newly created province of Rizal pursuant to the Philippine Commission Act No. The town of Las Piñas was also a major war theater during the 1896 Philippine Revolution, as it was occupied by forces of General Emilio Aguinaldo. Years later, Las Piňas also became a central battleground between Spanish and Philippine forces during the Philippine Revolution. In 1880, the city experienced an outbreak of cholera and smallpox leading to the loss of many lives. Las Piňas is famous for its Bamboo Organ, which was built by Fr. Felix Timbang was the first gobernadorcillo in 1762, while Mariano Ortiz was the first municipal president of the town of Las Piñas. On the other hand, Manuel Buzeta recorded the date at 1797. Las Piñas was formerly called 'Las Pilas' due to its separation from Parañaque due to tribal conflicts. It was proclaimed as a province of Manila either in 1762 or 1797. He directs the UT Physicians Rheumatology Clinic at the Texas Medical Center in Houston.Las Piñas was one of the earliest fishing settlements on the shores of Manila Bay. Tan is registered in musculoskeletal sonography (RMSK) by the American Registry for Diagnostic and Medical Sonography (ARDMS), and also holds the Musculoskeletal Ultrasound Certification in Rheumatology (RhMSUSTM) designation from the American College of Rheumatology (ACR). Finger Chair in Autoimmune and Connective Tissue Diseases since 2011. He was elected to the Alpha Omega Medical Society in 2006 and was promoted to Professor of Medicine in 2010.

He was Program Director for the Rheumatology Fellowship from 2005 to 2018. He received the UTHealth Master Teacher Award in 2005, and is a recipient of multiple Dean’s Teaching Excellence awards (2005 to 2014). Tan was promoted to tenured Associate Professor of Medicine (with tenure) in 2004. He was one of the Principal Investigators of Centers of Research Translation in Scleroderma at UTHealth.

His research interests included the contribution of genetic factors that influence susceptibility to autoimmune diseases such as lupus and scleroderma and the analysis of gene expression patterns in tissues and cells from patients with connective tissue diseases to discover biological pathways that are relevant to disease pathogenesis or act as potential biomarkers that help predict disease outcome. He joined the faculty as Assistant Professor of Medicine in 1998. Tan completed his residency at the University of Texas Health Science Center at Houston (UTHealth) and served as Chief Medical Resident in the Department of Internal Medicine before completing the rheumatology fellowship program at UTHealth.

Dr filemon tan