Coach Mastebroek is the founder and director of STREAMLINE Texas Swim Camps and is regarded as one of the top stroke technicians in the area. She has developed a stroke analysis system which she applied to perform over 500 frame-by-frame stroke analyses with the aid of underwater video and motion software. Coach Mastebroek has had the privilege to work with and learn from American as well as European Olympic Coaches whom she flew in to guest coach at her STREAMLINE camps. In addition, she has traveled to Europe to learn from elite biomechanics at the Dutch Olympic Training Center in Eindhoven, the Netherlands.
Coach Mastebroek is a former elite swimmer and holds multiple titles, among them: European Champion (Athens, Greece- 1991), Dutch Record Holder, and World Championship Finalist (Perth, Australia- 1990). At one point she was ranked number one in the world in the 50 freestyle. As a member of the National Swim Team in the Netherlands, she traveled to compete and train in more than 20 countries. In 1993, Mastebroek was recruited by SMU, where she was NCAA Division I All American, won several SWC and NCAA Division I medals, and ended her career with a 2nd place team finish at the NCAA Division I Championships in 1996.
Coach Mastebroek is currently the Head Coach of the Coppell High School swim program, which she has been rebuilding since her start with the program in 2016. She also has years of club coaching experience coaching swimmers at all levels, from novice to state and national levels.