O'Neil Brown began his stellar collegiate soccer career at Durham in 1994.

As a member of the Durham College men's soccer team, O'Neil made an immediate impact in the OCAA, leading the Lords to provincial prominence and recognition in each of his three years.

In total, he led his teams to three OCAA provincial medals (bronze in 1994 and 1995; silver in 1996). He was named an OCAA league all-star twice, a championship all-star and Durham College men's soccer MVP twice (1994 and 1995). He was recognized nationally in 1995 by being awarded a CCAA all-Canadian award.

After graduating from business administration, O'Neil capped off standout college career by becoming the first Durham College athlete to be drafted professionally. O'Neil was chosen first overall by the Toronto Shooting Stars in the NPSL Entry Draft in 1997. He would later sign and play with the Edmonton Drillers of the NPSL.

O'Neil was named a member of the OCAA men's soccer all-millennium team.