The Palomar Testbed Interferometer (PTI) is a long-baseline, near-infrared interferometer located on Palomar Mountain.
PTI has been in operation since 1997 and is used for extensive science observing as well as technical development. I will
review the recent progress at PTI covering both science and instrumentation work. The science topics include
fundamental stellar properties, novae, and an evaluation of all calibrator observations. The technical work includes the
narrow-angle phase scanning mode and installation of the integrated optics combiner IONIC.