Colmenares was primarily a disciple of the French historical school (known as the annals) and promoted in Colombia research methods based on extensive use of previously unknown documents, such as notarial deeds, accounts of real offices and wills, which constitutes a fundamental break with the traditional historiography. This bias, which it shares with other historians of his generation, as Jorge Orlando Melo, Margarita Gonzalez, Hermes Tovar and Alvaro Tirado-Mejía make his work is refreshing, decisively marking the "New History of Colombia." He was a professional historian, devoted all his energy for almost thirty years, to research, teaching and writing the history of Colombia.
"Before him, indigenous peoples prior to the discovery did not reach a million people, after him, the figures given are four or five million. Before Colmenares, the colony was a time of courtly disputes between viceroys and archbishops and bureaucratic conflicts in hearings and town meetings, then it became time to mines and slaves, indigenous workers, landowners and merchants, of crime and violence. " (José Eduardo Rueda Enciso).