After completing his legal studies, Concini briefly lectured on canon law at the University of Pisa in 1560 and gained experience as an auditor at the Rota in Mantua.
This achievement marked a significant moment in Concini's career, solidifying his position at the Medici court and earning him the title of Count of Penne.
[4] In 1589, Concini's expertise was sought, due to his legal knowledge and significant political sway, concerning the arrangement of the University of Siena, as the plan appeared to have been formulated by those with limited practical understanding.
A Lucchese envoy to the Florentine court in 1600 observed that Concini remained in charge of examining all papal communications and authorizations arriving from Rome, without whose approval no official would venture to proceed (Relazioni di ambasciatori lucchesi, p. 127).
While Torelli, for instance, had consistently conferred about the documents and requests he had to endorse as "First Secretary" with Cosimo I, Concini under Ferdinando I merely held the title of the position and never engaged in direct discussions with duke.