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Justine Mathieu is the Principal Broker of Mathieu Newton Sotheby’s International Realty, where she focuses on supporting agents and creating an environment where they can do their best work. Growth-minded, detail-driven, and grounded in strong values, she plays a key role in compliance, operational improvement, and long-term strategy for the brokerage. She earned her real estate license while in college, working part-time as an assistant to her father, and graduated Summa Cum Laude from Framingham State University before beginning her career at State Street Corporation. Since returning to the real estate industry in 2007, Justine has strengthened the brokerage through thoughtful leadership, refined systems, and a commitment to continual improvement. She collaborates closely with the leadership team to enhance the company’s culture, elevate agent performance, and ensure the business continues moving forward. A Westborough native who also spent years living in Brookline and Brighton, Justine loves reading, fitness, nature, and spending time with family and friends. She can often be found out on a walk with her Pug, Elly.