The Fiber Sources and Applications Group at NIST, Boulder is seeking one or more individuals for projects focused on the application of optical frequency combs to time-frequency transfer and ranging. The group has developed optical two-way time-frequency transfer techniques capable of synchronizing clocks to within a femtosecond over 100-km scale paths and at terrestrial velocities.  We have also developed comb-based techniques to perform ranging with nm-level precision.  To do this, we have leveraged the advent of robust optical frequency combs along with advanced digital signal processing techniques. Current work focuses on (i) the continued advancement of optical methods of transferring time and frequency information for practical terrestrial and satellite operation, (i