Mart den Rooijen is via het bedrijfsleven (chemisch laboratorium) overgestapt naar het onderwijs. Met de bevoegdheden natuurkunde, scheikunde en wiskunde heeft hij 30 jaar lesgegeven in het Middelbaar Laboratorium Onderwijs. Tevens heeft hij de stage verzorgd.
Daarnaast heeft hij circa 10 jaar bijscholing gegeven op het gebied van kwaliteitszorg/statistiek voor bedrijfslaboratoria en instellingen.
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