Agent Directory
Agent Directory
Mary Slay
314-725-5100 / Office
314-779-8980 / Cell

Mary Slay


Over-Delivering on Expectations has been

the hallmark of Mary’s Career!


As an account professional and a product manager Mary has a deep background in training, management, analytics and promotions. Her success as a Realtor is built upon an exceptional understanding of trends, details and processes that engenders loyalty and confidence with buyers, sellers and colleagues alike.

Mary is an enthusiastic people person who listens with interest and intensity. She has a flair for the esthetic and is always able to perceive both the style possibilities and the fit for customers. A workaholic by nature, she is creative, tireless and thorough, but her warm easy smile and sense of humor will rule the day when it comes to working well with others and tackling the details.  Mary is a super-star realtor!



  • Associate of Arts Degree from Southwestern Illinois College
  • Numerous Professional Development Certifications including:

            Store Operations Training Program

            Leadership Toolbox   

            Analytics Summit


Previous Work Experience:

  • Saks Fifth Avenue Department Manager
  • Estee Lauder Account Executive
  • Estee Lauder Regional Operations Director including Neiman Marcus, Foleys and Famous Barr

Mary shares her life with her husband, Hank, and her adorable son and puppy. Mary loves to cook for her large group of family and friends, but she also loves dinner out and is always a source for new restaurants and shops around town.


When you meet Mary Slay,  you will be sold!


What My Clients Say ...

Seller of 25 Trent Drive and purchaser of another home writes…     

My wife and I couldn't be happier with our decision to hire Penny and Mary.  The sale of our Trent Drive home was fast and easy thanks to their large database of contacts and marketing strategy.  While we certainly appreciated this, we are most appreciative for their patience, responsiveness and guidance during the search for our next home in a very competitive market.  After a roller coaster of missing out on several homes, we finally found the right one.  Penny and Mary were just as responsive and patient as they were at the beginning of our search.  4/19/22

GH writes...

Mary and Penny provided top-notch service and insight from the initial contract offer, negotiation and acceptance of the offer, through inspections and closing.  Their guidance and market intelligence in this current competitive and fast-moving home market made purchasing my forever home a reality.  Their service was seamless and the communication couldn't have been better.   4/20/22

Scott & Kelly R. write…

We are so grateful to have had Penny and Mary help us find our amazing home.  They made the process simple from starting to look to closing.  Both are great with communication, answered when called or texted and always had knowledgeable answers.  When negotiating, what was in our best interest was their top priority.  We would recommend them to anyone.  4/20/22

LGS writes…

Mary and Penny could not have been more professional in the selling of one home and purchase of another. Their expertise far exceeded any realtor I’ve ever dealt with. I truly feel blessed to have the good fortune to have had them represent us. The print material and video in the listing were superb. Everything was handled to perfection from getting the house ready, to showings, to the closings. Thank you for all your dedication and hard work!  4/25/22

Satisfied Seller writes…

Mary and Penny provided exceptional service to our family that was above and beyond our already high expectations.  This was our family home for the past forty years and now was owned by the adult siblings.  Mary & Penny were sensitive to the emotional attachment that all of us had for our home.  Their extensive knowledge of the market was apparent.  Their guidance and hard work helped our family achieve the goal that we had asked of them. Mary & Penny have our family’s deepest gratitude for their exceptional efforts.  4/21/22

Tom Schaefer writes…

I had a very positive experience with Mary and Penny as my buyer's agents. They were professional and helpful throughout the entire process of showing, closing, and everything along the way.

I highly recommend them.  4/20/22

JFD writes…

I had very specific notions about where I wanted to move following my service to the City of Town & County, but few definitive ideas about how to make it happen.  Penny and Mary solved that challenge for me!  Not only did they find the perfect home in my ideal location, but they helped me present a winning offer in a very competitive and complex market.  As if that wasn’t enough, they marketed and sold my existing home to a strategic buyer, allowing me to maximize the return on my investment.  Penny and Mary are very professional, smart and hardworking, and I could not be more grateful for their advice and representation.  4/20/22