Tasso Feldman — Irving Feldman — Tasso Feldman — Irving Feldman

Feldman recurred across all six seasons as emergency physician Irving Feldman, providing continuity in Chastain's daily clinical life while larger leads changed.

The role was his most sustained television credit and expanded from background support into a recognizable member of the hospital team. Public filmographies, rather than invented celebrity updates, are the appropriate limit for this working actor.