How did George Grant Elmslie contribute to Louis Sullivan’s work?

George Grant Elmslie served as a loyal assistant to Louis Sullivan for 20 years, playing a significant role in the firm's output during a period of declining commissions. His contributions were particularly vital in the following areas:1

• Architectural Ornamentation: Elmslie was a skilled designer who emulated Sullivan’s signature style. Much of the intricate cast-iron ornament found on the Carson Pirie Scott building is attributed to him.1
• Bank Designs: As Sullivan’s work habits became increasingly erratic in his later years, Elmslie took on substantial design responsibilities. He is credited as the primary designer of the National Farmers’ Bank in Owatonna, Minnesota, and is believed to have had considerable influence on the design of Sullivan’s series of small banks throughout the Middle West.21

Elmslie remained with Sullivan until 1909, when he departed to pursue a partnership in Minneapolis.1