Kalaw was born in
Lipa,
Batangas, on March 31, 1884. He was the third of four children of police chief Valerio Kalaw and Maria Manguiat. His siblings were scholar and political scientist
Maximo, and two sisters, Rosario and Manuela. Kalaw finished his secondary studies at Instituto Rizal in Lipa, Batangas, and finished his bachelor's degree in arts with honors at
Liceo de Manila. He took up his law degree at Escuela de Derecho, where he was mentored by
Rafael Palma and
Juan Sumulong. In 1905, he topped the bar examinations, having obtained "grade of 100 percent in civil law and three other subjects". Kalaw served as secretary of then
Philippine Assembly Majority Floor Leader Manuel L. Quezon until 1908. == Journalism ==