Background
Jackie was born in Waukegan, Illinois, the youngest of 8 children, to a carpenter father (Siebert) and homemaker mother (Edith Adeline), the latter of whom only finished fifth grade.
Jackie was born in Waukegan, Illinois, the youngest of 8 children, to a carpenter father (Siebert) and homemaker mother (Edith Adeline), the latter of whom only finished fifth grade.
She played in the All-American Girls Professional Baseball League in 1950 and 1951, batting and throwing right-handed. She measured in at 5 foot 5 inches, weighing 100 pounds. Her mom was thus not always supportive of Jackie"s love for baseball, with Jackie recalling: "She didn’t like it at all.
She could not understand why her ‘little girl’ found every moment she could to play baseball with the boys.
I joined them, and was two hours late getting back home. I was even late for supper, and as punishment, had to go without."
But it was not to be helped.
Jackie simply "fell in love with the round ball when was just able to walk. And there began her introduction to organized ball.
Her coaches in the Milwaukee playground were impressed with her passion for the game accompanied by her strong arm.
Her love for sports was not confined to baseball though. Jackie also did well at basketball and speed skating, amongst other recreational activities. In 1944, Jackie became a bullpen catcher in a men"s baseball team, which was where she learned to catch.
She then moved on to catching in a local recreation department indoor softball league.
During this time, she developed strong enough skills to be recruited to play fast-pitch ball a year later for the West Allis fast pitch league, having been sent by Bunny Brief and Jack Kloza. This league had a reputation for being a stepping stone to the AAGPBL. Jackie played on the Majdecki Foods team alongside Eileen Burmeister, Marge Peters, and Edna Scheer, winning the championship 1-0.
lieutenant was only this game that Jackie"s mom watched her play. But a year later she went back to Milwaukee, studying at the city"s South Division High School and getting a diploma.
During this time she was also able to play competitive ball again, working for Majdecki Foods to support herself.
She then became a detailer and draftsman for the National Enameling and Stamping Company. Foreign two years thereafter she played with the amateur Milwaukee Jets. She was seen by an AAGPBL scout and asked to try out for the league in Newark, in 1949.
She was asked to participate in spring training that year with the South Bend Blue Sox.
She was assigned to the Springfield Sallies in 1950 and played in 48 games. Mattson later married Robert Orville Baumgart and raised a family.