A family of Real Estate Professionals
Expertise, personal attention and proven results are the hallmarks of the MercFoss Team of Coldwell Banker Realty, Lake Forest office, with over $176 Million in career sales.
Our vast professional network ensures every need is met, from staging to financing, disclosures and negotiations. This sophisticated, comprehensive approach has earned the MercFoss Team continual achievement awards and recognition.
The MercFoss Team successfully demonstrates what it means to have cohesive teamwork. Each member has their specialty, along with certified licensing and experience. We are a family of real estate professionals that offers our clients a personalized plan and the feel of a small boutique office, backed by the international marketing presence of Coldwell Banker Realty.
Whether you’re looking to buy, sell or invest throughout the Chicago North Shore and surrounding suburbs, Donna Mercier, Donielle Foss Crimmins and Chris Foss provide the skill, connections and dedication to guide you through all the intricacies of your real estate transaction.
With a wealth of real estate knowledge gained over three decades and a reputation for excellence, Donna Mercier is a trusted leader within the MercFoss Team—an award-winning group of luxury real estate professionals known for their integrity, market expertise, and personalized service. Donna’s leadership shaped the team’s boutique-style approach, offering clients the warmth and attentiveness of a small firm, paired with the global reach and marketing power of the Coldwell Banker Global Luxury® brand.
Donna is a Certified Luxury Home Marketing Specialist (CLHMS™) and a member of the prestigious Institute for Luxury Home Marketing. Her deep understanding of the North Shore market, combined with her strategic insight and negotiation skills, has earned her features in The New York Times, Michigan Avenue Magazine, and NBC News. She is consistently recognized as a top producer in the Lake Forest office, even during the most competitive and challenging market conditions.
A Lake Forest resident for more than three decades, Donna is deeply committed to her community. She serves on the Lake Forest/Lake Bluff Alumni Board along with supporting the Coldwell Banker Charitable Foundation and actively involved in local outreach initiatives. Her passion for real estate is matched only by her dedication to helping clients achieve their goals with confidence, clarity, and care.
Donielle Foss Crimmins brings a unique blend of market knowledge, client advocacy, and heartfelt dedication to her role as a key member of the MercFoss Team. A certified Short Sales and Foreclosure Resource (SFR®), Donielle is known for her ability to navigate complex transactions with ease, always putting her clients’ needs first. Her deep understanding of local pricing trends, marketing technologies, and negotiation strategies makes her a trusted advisor for both buyers and sellers.
As a full-time, licensed real estate professional and lifelong Lake Forest resident, Donielle is deeply rooted in the community. She and her husband are actively involved in local events and charitable efforts, including support for the Guild of St. Mary and regular contributions to the Coldwell Banker Charitable Foundation. Her genuine care for others shines through in every interaction, and she is known for making the real estate process not only smooth but enjoyable.
Donielle’s clients appreciate her responsiveness, warmth, and ability to turn what can be a stressful experience into a positive and empowering journey. Whether helping a first-time buyer or guiding a seasoned investor, she is always just a phone call away—ready to listen, advise, and deliver results.
As a dedicated professional Real Estate Agent with Coldwell Banker Residential in Lake Forest, IL, I have proudly served clients since 2003, all with the same trusted office. As part of the MercFoss Team, a seasoned group of three professionals, I specialize in high-end residential real estate and bring valuable commercial real estate experience to the table.
As the cornerstone of local property knowledge and valuation expertise, I significantly enhance our team’s capabilities by empowering clients with a deep understanding of the market. This insight enables them to strategically navigate their real estate journeys, optimizing both the timing and positioning of their listings and offers. Raised in Lake Forest and now a proud resident of the Whispering Oaks neighborhood, I bring not just professional knowledge but also personal insight into the local lifestyle and community.
Whether you're buying your first home, upgrading, downsizing, or exploring investment opportunities, I’m here to guide you every step of the way. My approach is responsive, attentive, and client-focused—ensuring your goals are heard, understood, and exceeded. I also leverage proven marketing strategies to help your home stand out and sell successfully in today’s competitive market.
Let’s connect and explore how I can help you achieve your real estate goals. I’d be honored to be part of your journey, call today and let’s get started.
WE’RE CREATIVE
We blend innovative marketing strategies with a keen eye for design to showcase every property at its absolute best—because selling homes is both an art and a science.
WE’RE PASSIONATE
We’re driven by a deep love for real estate and a commitment to helping our clients achieve their dreams—because your success is our greatest reward.
WE’RE DYNAMIC
We adapt quickly, think strategically, and move with purpose—because in real estate, momentum makes all the difference, and staying ahead means never standing still.
"Chris was easy to work with, created excitement with our property, and allowed parties to close on the house in 30 days without a hitch." - Home Seller
"Donielle Foss was a joy to work with throughout the entire process. She worked tirelessly to make sure we found our perfect home and advised us appropriately to ensure we obtained it." - Home Buyer
"Donna sold our home within 6 weeks and did the most amazing brochure, pictures and write-ups on our home that all our friends were amazed." - Home Seller
"The value of the team approach cannot be under-estimated. Collectively, the team represented our home to a wide variety of buyers and each team member could effectively describe the features and advantages of our property resulting in an offer in 45 days." - Home Seller
© 2025 Coldwell Banker Real Estate LLC
The property information herein is derived from various sources that may include, but not be limited to, county records and the Multiple Listing Service, and it may include approximations. Although the information is believed to be accurate, it is not warranted and you should not rely upon it without personal verification. Affiliated real estate agents are independent contractor sales associates, not employees. ©2025 Coldwell Banker. All Rights Reserved. Coldwell Banker and the Coldwell Banker logos are trademarks of Coldwell Banker Real Estate LLC. The Coldwell Banker® System is comprised of company owned offices which are owned by a subsidiary of Realogy Brokerage Group LLC and franchised offices which are independently owned and operated. The Coldwell Banker System fully supports the principles of the Fair Housing Act and the Equal Opportunity Act.
