During his 27 years lasting pro career (1914–41) he was known as the "Babe Ruth of basketball". He is mostly known for his time with the Original Celtics (1918/19, 1921–27, 1929).He was enshrined in the Naismith Memorial Basketball Hall of Fame in 1973.
Beckman began playing for St. Gabriel's Catholic School in Manhattan as a 15 year old in 1910. He did not attend college but instead played for the Opals of the Hudson County League in 1910. In 1915, Beckman played for De Neri, an EL team based in Philadelphia, he played 34 of the team's 40 games, making 88 field goals and 74 free throws. Concluding the season with 250 points and finishing third in scoring in the EL, with an average of 7.4 points per game - a high average in a low-scoring basketball era. In the 1917-18 season, the EL was postponed early because of World War I. Beckman led the EL in scoring with 9.25 points per game.
The 156 pound forward, was referred to as one of the true stars of the earliest years of basketball. He was considered the best free-throw shooter of his era. His prolific free-throw shooting and gritty playing style always excited crowds. In 1918, Beckman's teammate, Chris Leonard of the Original Celtics, considered Beckman, "a master of the fastbreak", due to his lightning speed. Beckman was a complete offensive player respected for his scoring ability, having outstanding shooting ability along with his slashing ability. He was credited as a valuable team player, for his selflessness and commitment in teamwork, passing and team defense.
- Peterson, Robert W. (2002). "The Rise of the Original Celtics". Cages to Jump Shots: Pro Basketball's Early Years. Lincoln: University of Nebraska Press. pp. 69–79. ISBN 0-8032-8772-0.
- "Hall of Famers". Basketball Hall of Fame. Archived from the original on 2009-08-31. Retrieved 2013-04-02.
- Porter, David L. (2005). Basketball: A Biographical Dictionary. Greenwood Publishing Group. ISBN 9780313309526.
- Nelson, Murry (1999). The Originals: The New York Celtics Invent Modern Basketball. Popular Press. ISBN 9780879727949.
- "The Naismith Memorial Basketball Hall of Fame :: John Beckman". www.hoophall.com. Retrieved 2019-07-20.
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