A historical figure in contemporary Peru, his participation in the National Liberation Army in the 1960s brought high media scrutiny,[2][3] in addition to refusing to call Venezuela's current government under Nicolás Maduro a dictatorship.

His essay about the liberation movement in the sixties Peru 1965: Notes of a Guerrilla Experience,[5] won the Latin American Casa de las Americas Prize in 1969 and was published in multiple languages.

[16][17] Béjar has been a professor at the Pontificia Universidad Catolica del Peru since 2014 and at the same time, Bejar was also a columnist in several international magazines.

In the seventies, Béjar and former Velasco's collaborators formed CEDEP (Centre for Development and Participation) one of the first Peruvian Non-Governmental Organisations.

[24] He resigned on 17 August 2021 amid criticism for stating in a private webinar, one year before being Minister, that some elements of the Peruvian naval high command "had been responsible for terrorist acts" in the seventies against the administration of Juan Velasco, and furthermore had been trained by the CIA to do so as outlined in US diplomatic cables published by Wikileaks.