The introduction of invasive species, along with climate change and habitat loss, are among the primary concerns for the conservation of biodiversity at a global scale. In this dissertation, I will assess the invasion process for Psittaciformes, more generally known as parrots, parakeets, cockatoos, and their kin. The introduction provides a review for the development of the field of invasion biology/ecology, as well as the relevance of parrots as species that have established non-native populations on all continents (except Antarctica). In Chapter 1, I review the available data on the presence and invasive status of all known non-native parrots at a global scale, to identify what species are the most widespread, determine the extent of their non-native distribution, and confirm what regions have the most non-native parrot species. In Chapter 2, I analyze the climatic and geographic determinants of non-native parrot distributions outside of their native range. Using species distribution models, the environmental space occupied by these species will be compared between their native and non-native range to determine whether they are subsets of one another or if there is divergence between the environmental niche spaces they occupy. These results are validated with the incorporation of null models trained using the same local environment data. In Chapter 3, I analyze the population genetics of the Monk Parakeet (Myiopsitta monachus), one of the most widespread non-native parrots, in order to confirm known patterns about the origin and genetic diversity of its non-native populations, including the previously unsampled populations of Chicago, Illinois and Aguada, Puerto Rico. This study also examines the demographic history of the different populations within the native range along with its only congeneric species, the Cliff Parakeet (Myiopsitta luchsi). Finally, I conclude the dissertation with a discussion on the results uncovered throughout the different chapters and the future projects I intend to investigate.