Ko was a professional player with the Chicago Power (NPSL) during the 1991 thru 1994 seasons. He also played with the Chicago Stingers (1995 & 1996) of the USISL- Division III before retiring to begin full-time coaching. Ko was selected the Illinois Youth Soccer Association 1999 Girls Coach of the Year.

Ko was an All-State player at Rich South High School (Park Forest, IL) for veteran coach Tony Maturano, graduating in June of 1986. He was named to the All-Conference SICA Conference team for four consecutive years during his outstanding prep career. He played with his younger brother Nick (then a freshman) for one year while at Rich South High School (in 1985).

Ko recently started his own sports apparel company, named KOJON.

Collegiate career

In his Collegiate career, Ko was a standout at University of Illinois - Chicago (UIC) from 1987-90 where he played for coach Bill Ross. He still holds many career scoring and assists records at UIC where he won All-Conference honors all four years. He graduated with a degree in graphic design in 1991.

Coaching experience

Ko joined the coaching staff of the Sports Club (now known as the Chicago Magic SC) in Frankfort, IL for 3 years (1994-1997) before moving away to independently form the Windy City Pride. Ko holds a National "B" coaching license.

WCP teams have captured numerous State Cup and Regional titles under Ko's direction. Ko won two Illinois State Cup championships while with the Sports Club/Chicago Magic SC. His U-12 and U-13 girls won the 1997 State Cup titles while part of the Chicago Magic. The Windy City Pride SC won the U-13 & U-14 Girls in 1998. In addition, the Pride won the State Cup titles for the U-14 girls in 1999.

College coaching experience

Ko was the head women's coach at St. Francis University in Joliet, IL where he started the women's' soccer program in 1996. His three-year record was 12-35-5 at the NAIA school with only a very limited financial aid assistance program for his recruited players.

1999 IYSA Coach of the Year

Ko was selected the Illinois Youth Soccer Association 1999 Girls Coach of the Year. His players have acknowledged that they have become better players thanks to Ko's extensive development ability. Ko founded the Windy City Soccer Club and was one of the first coaches to provide quality training for girls in the Chicago area. His emphasis on the importance of sportsmanship in soccer and on the skills gained from a good work ethic has changed the lives of many players. Ko stresses the importance of learning in order to advance to the next level. More importantly, players believe in their own abilities more faithfully because they know that Ko truly believes in what they can accomplish.