[1] He has held visiting positions at the University of North Carolina at Chapel Hill and the Mathematical Sciences Research Institute in Berkeley, California.
Starting from late 80s until mid 90s, they had a spectucalar progress in the study of global regularity of the Bergman projection and of the ∂-Neumann problem.
In particular, they have proved the global regularity in the sense of preservation of Sobolev spaces on large class of pseudoconvex domains.
He has served as the editor of the Notices of the American Mathematical Society between 2011 and 2003, took part in editorial duties in several research journals.
Boas is also known for his excellence in teaching and expository works, including Reflections on the arbelos (for which he won the Chauvenet Prize in 2009).