[5] During this time he held multiple posts: Head of the Office of African States and the franc zone from 1980 to 1982, the Office of foreign investments in France and French overseas investments between 1982 and 1984, Deputy Director of Credit Institutions from 1984 to 1986 and Deputy Director, Head of the Finance and Holdings Department from 1986 to 1990, which included working alongside Jean-Claude Trichet on large privatization campaigns.
[4][11] In 1990 Théodore became the Chairman and CEO of Société des Bourses Françaises (SBF), the main French Cash financial market at the time.
[8][12] His next efforts were concentrated on forming a new pan-European exchange and moving the European financial market to a more modernized structure.
In part, the success and speed of achievements were attributed to his modest approach, absence of arrogance and strength of conviction.
[11] He was described as having a Gallic sang-froid as well as charm, being prudent, patient and paying a great deal of attention to details.