Abstract: This talk is based on joint work with Allen Knutson and Jenna Rajchgot. Orbit closures of quivers come up in several of areas of mathematics, for example: representations of finite-dimensional algebras, Lusztig's construction of the canonical basis, generalizations of determinantal varieties, and degeneracy loci for maps of vector bundles. This talk is most related to the last one, where "formulas" for orbit closures means their equivariant K-classes and cohomology classes. Previous work of many people produced such formulas in the case where all arrows of the quiver point the same direction, often having positive structure constants in some particular basis. We generalize some of these formulas to Type A quivers of arbitrary orientation. The main ingredient is the bipartite Zelevinsky map constructed in previous work of Rajchgot and mine, which identifies orbit closures with intersections of Schubert varieties and opposite Schubert cells in a partial flag variety.