Some are, almost all in the introductory classes (including me) and many in the upper division classes are undergrads. (u)GSIs at Berkeley are paid particularl

Some are, almost all in the introductory classes (including me) and many in the upper division classes are undergrads. (u)GSIs at Berkeley are paid particularly well compared to other schools, I think in large part due to the TA union (UAW 2865).