People United States of America Matthew Sleeth peoplepill id: matthew-sleeth-1MS 11 views today 11 views this weekAmerican environmentalistMatthew SleethBiographyListsAlso ViewedListsMatthew Sleeth is in following listsBy field of workNotable American activistsGender:MaleBy work and/or countryNotable American EnvironmentalistsGender:MaleFrom our partnersSponsoredMatthew Sleeth