The Ocean Observatories Initiative Facility Board hosted a 2023 summer school July 17-21, 2023 at Oregon State University in Corvallis focusing on OOI optical attenuation and absorption data. A mix of advanced graduate students, post-doctoral fellows, and early career scientists traveled to Oregon to participate in a hands-on learning experience about how to access, analyze, and interpret data from the Sea-Bird AC-S. Data from the AC-S is used to characterize the absorption and scattering of light in seawater, which provides information on phytoplankton biomass in the measured ocean region.