Answer by taking a quote from the following article:

Walter Francis O'Malley (October 9, 1903 - August 9, 1979) was an American sports executive who owned the Brooklyn/Los Angeles Dodgers team in Major League Baseball from 1950 to 1979. In 1958, as owner of the Dodgers, he brought major league baseball to the West Coast, moving the Dodgers from Brooklyn to Los Angeles despite the Dodgers being the 2nd most profitable team in baseball from 1946-1956, and coordinating the move of the New York Giants to San Francisco at a time when there were no teams west of Kansas City, Missouri. For this, he was long vilified by Brooklyn Dodgers fans. However, Pro-O'Malley parties describe him as a visionary for the same business action, and many authorities cite him as one of the most influential sportsmen of the 20th century.

Walter O'Malley was the only child of Edwin Joseph O'Malley (1883-1955), who worked as a cotton goods salesman in the Bronx in 1903. Edwin O'Malley later became the Commissioner of Public Markets for New York City. Walter's mother was Alma Feltner (1882-1940). O'Malley grew up as a Bronx-born New York Giants fan. He frequently attended Giants games at the Polo Grounds with his uncle Clarence. O'Malley was a Boy Scout who rose to the rank of Star.  O'Malley attended Jamaica High School in Queens from 1918 to 1920 and then the Culver Academy (the eventual high school alma mater of future New York Yankees owner George Steinbrenner) in Indiana. He managed both the baseball and tennis teams, served on the executive staff of the student newspaper, was a member of the Hospital Visitation Committee as well as the debate team, Bible Discipline Committee and the YMCA. At Culver, his baseball career was ended with a baseball that hit him on the nose.  Later, he attended the University of Pennsylvania (Penn) and graduated in 1926 as the senior class Salutatorian. At Penn, he was initiated into Theta Delta Chi, and he also served as president of the Phi Deuteron Charge. Upon his graduation from the University of Pennsylvania School of Engineering and Applied Science his father gave him a cabin cruiser that slept eight. He was also Junior and Senior class president. O'Malley originally enrolled at Columbia University in New York City for law school, but after his family lost their money in the Wall Street Crash of 1929, he switched from Columbia Law School to night school at Fordham University. Edwin O'Malley's dry goods business was failing and Walter had to help run the business.

Did he attend any other schools?
he switched from Columbia Law School to night school at Fordham University.