Abstract: The instant disclosure relates to the use of engineered proteins such as Cas9, Cpf1, TALE and Zinc finger proteins attached with a viral integrases, recombinase, or transposase in order to deliver a DNA sequence of interest (or gene of interest) to a targeted site in a genome of a cell or organism. The use of a Cas9 that is inactive for its function in cutting DNA will allow the use of Cas9 proteins ability to target DNA by the use of RNA guides without causing DNA breaks as intended in other systems for homologous recombination. The use of zinc finger proteins or TALE (engineered proteins that bind specific sequences of DNA) attached to the viral integrase or the recombinase is also disclosed. The system may be used for laboratory and therapeutic purposes. A gene of interest can be included in a cell with a gene lacking the ability to produce its gene product to recover the normal gene product in the cell (e.g. gene product may be a protein or specialized RNA).