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Per Jonsson tog grundexamen fil. kand med tyngdpunkt på limnologi och geologi 1974. Därefter arbetat sammanlagt tre år vid miljövårdsenheter på länsstyrelser i Kopparbergs, Örebro och Norrbottens län. Anställd 1977-2009 vid Naturvårdsverkets forsknings- och miljöanalysavdelningar.

Disputerat i sedimentologi vid Uppsala universitet 1994. Docent i recent marin sedimentologi våren 1996 och adjungerad professor i recent marin sedimentologi vid Institutionen för geovetenskaper hösten 1996. Gästprofessor i recent marin sedimentologi vid Institutionen för Tillämpad Miljövetenskap (ITM) vid Stockholms universitet sedan 2004.

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