Extract all the names of people that Betty worked with from the text.
Betty Branch earned her Bachelor of Arts in Studio Art (1979) and Master of Arts in Liberal Studies (1987) from Hollins University and completed additional studies with artists Denis Knight and Georgiana Mailoff, and at Miles and Generalis Sculptural Services. She lives and works in Roanoke, Virginia. Her first retrospective exhibition, Betty Branch: Through the Crow's Eye, a Retrospective, presented the artist's work in bronze, marble, porcelain, works on paper, and performance pieces.
Denis Knight, Georgiana Mailoff
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------
Betty Branch earned her Bachelor of Arts in Studio Art (1979) and Master of Arts in Liberal Studies (1987) from Hollins University and completed additional studies with artists Denis Knight and Georgiana Mailoff, and at Miles and Generalis Sculptural Services. She lives and works in Roanoke, Virginia. Her first retrospective exhibition, Betty Branch: Through the Crow's Eye, a Retrospective, presented the artist's work in bronze, marble, porcelain, works on paper, and performance pieces.
----------------
Answer the following query.
Extract all the names of people that Betty worked with from the text.

user
Denis Knight, Georgiana Mailoff
assistant