First Technician is a rank within the Space Corps. It is a low enlisted rank preceded by Second Technician and Third Technician. The rank First Technician is implied by the existence of the Second and Third Technician ranks of Arnold Rimmer and Dave Lister. The Red Dwarf novel Infinity Welcomes Careful Drivers explains that Petrovich held this position. Others seen in the television series who might possibly have held this position include Harrison and Selby.