About Us

Dan Firks: 630.637.9009

We understand that buying or selling a home is more than just a transaction: it’s a life-changing experience. That’s why our team of highly-seasoned real estate professionals is dedicated to providing exceptional, personalized service for all of our clients. We take great pride in the relationships we build and always work relentlessly on the client’s behalf to help them achieve their real estate goals.

Our team of experts represents the best and brightest in the industry, and we’re always striving to lead the field in research, innovation, and consumer education. Today’s buyers and sellers need a trusted resource that can guide them through the complex world of real estate. With our extensive knowledge and commitment to providing only the best and most timely information to our clients, we are your go-to source for real estate industry insight and advice.


Our philosophy is simple: clients come first. We pledge to be in constant communication with our clients, keeping them fully informed throughout the entire buying or selling process. We believe that if you’re not left with an amazing experience, we haven’t done our job. We don’t measure success through achievements or awards, but through the satisfaction of our clients.

As Broker/Owner of Defined Realty Group at Keller Williams in Naperville. Dan Firks imparts his nearly quarter-century of real estate wisdom and savvy upon each member of his growing team. In doing so, his agents succeed, of course. But much more important is the success of their clients, who have come to depend on Dan and Defined Realty Group as area experts who excel in understanding the market, its trends and the unique communities and neighborhoods throughout the area. “I’ve loved real estate ever since I was working for a rental house agency in 1993,” says Dan, who one day decided he wanted to get in on the action of the well-dressed professionals in the front of the office who were helping people buy, sell and rent homes. After a few years of showing rental properties, he earned his license and began developing his “superstar” image as a REALTOR®.

Dan and the members of Defined Realty Group take their clients’ decision to work with them seriously. “People are putting all their trust into us, knowing that we’re going to do a good job, steer them in the right direction and make it a stress-free, enjoyable process from the very beginning to the very end.” The thrill of working with buyers and sellers to help them with their most valuable asset is what drives Dan to continually improve his already impeccable service. As a REALTOR® and established, longtime resident of Naperville, Dan ranks in the top 1% of real estate agents nationwide. His team has received hundreds of five-star reviews on the most popular real estate websites.

For listings, Dan’s established processes help the team sell homes for top dollar with the shortest possible time on the market. “Before we list, we put every home in a private listing network for ‘coming soon’ so other agents can see what’s going to hit the market,” says Dan, noting that agents ask about the property before it goes live, which helps his team to focus on the most alluring aspects of each home and often is able to arrange an early sale. The team works with the seller to prepare the home to perfection prior to high-quality photography. “And social media is huge,” says Dan. “We reach out to every single agent who is selling homes in the area of the listing and we also boost social media ads, targeting specific types of buyers.”

In addition, because Defined Realty Group staffs its office all day, seven days a week, questions coming in by email or phone call are addressed immediately. From prospective buyers to clients and other agents, the team receives high marks for availability and responsiveness. They’ve also come to know Dan personally, seeing him out at favorite restaurants, volunteering with Fishes & Loaves Food Pantry and staying involved with an organization that empowers at-risk youth. He also is often seen walking and running his Great Schnauzer, Adonis, through Naperville’s beautiful forest preserve.

“We stay in contact with our past clients, reaching out with 33 touches a year,” says Dan. “Our customer appreciation party every summer is called “Firks Fest.” At Firks Fest, Dan opens his property to more than 300+ guests for a barbecue, open bar, music, dancing, giveaways, a raffle, fireworks and family activities like rock walls & 60ft inflatable obstacles. He and his co-sponsors even hire childcare, so the parents can enjoy the night!

“People know we care about them and want to stay in touch with them,” Dan says. “When someone is referred to us, we take such good care of them that whoever referred them to us looks like a superstar!” Dan explains that Defined Realty Group is expanding. In addition to himself, they have three buyers’ agents, a listing agent plus a listing coordinator, a closing coordinator, an executive assistant, social media department, public relations director and a website coordinator. “We’re looking for at least five-ten more real estate agents who want to join a top-producing team and learn all the things that I’ve learned over the years to grow their business,” says. “I want them to be superstars, too!”