Luca di Tommè headed a large, prolific workshop and was an influential contributor to the long legacy of Siena's celebrated artistic style, which flourished in the 1300s and 1400s. He was also active in Sienese government. Luca was probably trained by the Lorenzettis, owners of the most prominent workshop in Siena, whose work was distinguished by solid, three-dimensional forms and emotional depth. He probably learned both fresco and panel painting there, but none of his frescoes survive. Another early influence was likely the delicacy and elegant linearity of Simone Martini's work. In 1356 Luca joined Siena's newly founded painters' guild. He worked almost continuously for the Siena Cathedral. Luca's workshop created mostly altarpieces, and he often collaborated with other artists. His artistic output declined after the 1370s, possibly because his civic duties required more time. His style was marked by a growing facility at expressing emotion, relating figures to their settings by developing spatial depth, and a typically Sienese interest in drapery and ornamentation. Although Luca spent most of his working life in Siena, he also may have accepted commissions elsewhere in Tuscany.