Mário Augusto was Minister Counselor at the Angolan Embassy in Portugal and had functions in the Permanent Representation of Angola to the Community of Portuguese Speaking Countries (CPLP), having published in 2018 a book entitled "Os Conflicts em África e a Experiência de Angola na sua Resolution".
The diplomat replaces Daniel Rosa, who left in October 2020 to head Angolan diplomacy in Singapore, having not been appointed an ambassador since that date.
The new diplomat was born in Luanda, graduated in Law and specialized in African International Relations and in Law and Communication.
In March 2020, the then President-elect of Guinea-Bissau, Umaro Sissoco Embaló, accused João Lourenço of interfering in his country's internal affairs, for having received Domingos Simões Pereira in Luanda during the 2019 post-election dispute and criticized the treatment judicial decision given to the children of the former head of state José Eduardo dos Santos.
However, already this year, the Guinean president rejected any tensions with his counterpart, João Lourenço, saying that the two peoples are "brothers", during the funeral ceremonies of José Eduardo dos Santos, in Luanda, in early September.