Between 1959 and 1967 he won 9 national titles and set 13 national records in the 100 m and 200 m breaststroke.
After his active sports career, Mensonides continued his involvement with the sport by training swimmers, and he developed a swim analysis method with corresponding software. He also has a swim analysis website showcasing the software together with a blog about all technical aspects of swimming and swim analysis.
References
{{Commons category}}{{DEFAULTSORT:Mensonides, Wieger}}{{Netherlands-swimming-bio-stub}}{{Netherlands-Olympic-medalist-stub}} 12 : 1938 births|Living people|Dutch male swimmers|Male breaststroke swimmers|Olympic swimmers of the Netherlands|Swimmers at the 1960 Summer Olympics|Swimmers at the 1964 Summer Olympics|Olympic bronze medalists for the Netherlands|Sportspeople from The Hague|Olympic bronze medalists in swimming|Medalists at the 1960 Summer Olympics|European Aquatics Championships medalists in swimming