Since 2016, Romberger has run Ulises, a collectively run art bookstore and exhibition space based in Fishtown, Philadelphia, whose essayistic presentations constellate works of art, publications, and public programs around quarterly curatorial themes, much like a print magazine. Since 2018, the quarterly structure was put on hold to make room for "Publishing As Practice," a three-part publisher residency funded by the Pew Center for Arts & Heritage. Three experimental art publishers—Hardworking Goodlooking (April), Martine Syms (July-Sept), and Bidoun (Oct-Dec)—activate the storefront space of Ulises as exhibition and public programming hub, engaging the public through workshops, discussions, and projects.

The name Ulises is a tribute to the work and legacy of Ulises Carrión, a Mexican-born poet, conceptualist, and avant-garde artist who was an early pioneer and theorist of the artist’s book, and the founder of the Amsterdam based bookshop Other Books and So (1975–78).

Co-founders of Ulises include Nerissa Cooney, Lauren Downing, Gee Wesley, and Ricky Yanas.