The third series in the collection is the Gubernatorial and professional career series. The series covers du Pont's life as the governor of Delaware and continues into his later professional career as a lawyer and member of committees for organizations, including the Lynde and Harry Bradley Foundation and the Whitman Corporation.

The Correspondence sub-series includes the written and typed correspondence of Pete du Pont and his colleagues in the governor's office and at Richard, Layton & Finger law firm. There are several emails and memorandums included in the correspondence series.

The Schedules, planning, and finances sub-series include Pete du Pont's daily scheduling as the governor, as well as election data, travel documents, financial files, campaign planning documents, and political policy reports. This sub-series gives insight to du Pont's responsibilities in his various professional roles.

The Media sub-series includes du Pont's own documentation of his professional life, through the creation of scrapbooks and writing of manuscripts, as well as the general media's coverage of du Pont through newspaper and magazine publications. The sub-series includes drafts of du Pont's book, Tyuleniy Island, an historical fiction novel set in Russia, as well as the documented process of writing the Pete du Pont biography, including interviews and editorial correspondence.