Berdini became desirous of following a stricter interpretation of the Rule of St. Francis which Bernardine was promoting and he transferred over to the Observant Friars Minor, becoming one of the companions of the Apostle of the Holy Name of Jesus.

[1][2] A humanist, Albert was a speaker of learned eloquence, and under the guidance of Bernardine, Berdini's fame as an orator became so renowned that he was commonly known as the "King of Preachers" (Rex Praedicatorum).

[3] One of Berdini's main themes was peace, and he would become personally involved in peace-making in Modena, Perugia, Arezzo, Brescia, and Ferrara.

[4][5] The panel of the bronze door of St. Peter's Basilica, in Rome, in which Filarete sculpted the scene of the presentation of the Copts and Ethiopians, also handed down the image of Berdini alongside the papal throne.

[1] Albert, along with his teacher, Bernardine, is considered among the four great pillars of the Observant reform within the Order of Friars Minor.