What profession does Vincent take on while pretending to be someone else in GATTACA?

In GATTACA, Vincent takes on the role of a mission specialist at the space program while pretending to be someone else, specifically a genetically superior person named Jerome Morrow. By adopting this identity, Vincent is able to circumvent the rigid genetic discrimination that prevents him, as a naturally conceived human, from pursuing his dream of space travel. This position requires extensive knowledge and training in various scientific and technical aspects of space missions, which Vincent is able to navigate effectively due to his dedication and passion for space exploration.

The other options, while related to fields within the realm of genetics and biotechnology, do not accurately describe the specific role Vincent assumes in the film. The narrative focuses particularly on his aspirations to be a part of the space program, making the mission specialist role central to the plot.