His accomplishments included composing, arranging, acting as a staff musician at WLS radio in Chicago, TV guest appearances, concerts, and club dates at some of the top jazz rooms in the US.
In later years, Leon and Lee, with drummer Ed Uhlig and jazz violinist Eddie Vanna, played club dates in the Chicago area.
[5] The quartet also had the honor of being invited by President Carter to play one of the Inaugural Balls in 1977 and performed before 20,000 people at the National Visitors' Center in Washington D.C.[6] Leon died on November 25, 1979, from a heart condition.
At his funeral Mass, Jerry Cigler performed the Jerome Kern standard "All the Things You Are" in the rubato style made famous by Leon.
She also worked hard to preserve the memory of Leon by re-issuing his recordings on LP and cassette tape, through Sounds of Sash, Ltd.[5]