GGA: achievements and challenges

Now in 2019, we have completed our fourth year in charge of GGA. Before sharing our struggles and achievements, we owe a special thanks to our associate and friend, Professor Otávio T？ledo Nóbrega, from Universidade de Brasília (UnB), who, in an inspiring way, has served as an associate editor for GGA. In several occasions, he has also served as a reviewer and taken great care of the Editorial Manager submission system. We are also deeply grateful to all other associate editors, Professor Alexandre Leopold Busse, from Universidade de S？o Paulo (USP), Professor Ana Paula de Oliveira Marques, from Universidade Federal de Pernambuco (UFPE), and Professor Fausto Aloisio Pedrosa Pimenta, from Universidade Federal de Ouro Preto (UFOP), who have always promptly responded to our requests by balancing the demands of the journal with their duties.