prides herself on being a one-stop-shop for both buyers and sellers.


Her ability to listen and understand her clients' needs allows her to continuously exceed their expectations.  Amy is the most successful real estate agent in the South Haven/Lakeshore housing market with a  clientele consisting of investors, developers, first time home buyers, and vacation home buyers from around the world.  Amy is known for offering her clients top notch customer service and follow through. Over the past year, she has sold over $20 million dollars in lakeshore properties, with over $30 million dollars in exclusive listings.​

Her personable and professional character allows Amy to build and maintain solid relationships, which explains why her business has grown mostly from referrals and repeat clients.  Despite Amy's busy schedule, she still finds time to give back to her community, being very passionate about volunteering her time and money to support numerous charities and causes.  Amy grew up in Holland, Michigan and received both her Bachelor's degree and Master's degree from Western Michigan University. After a career in Cardiopulmonary Rehabilitation,  she moved to South Haven to pursue her dream of real estate. When not working or spending time with her family, you can find Amy running on the beach, collecting beach glass, or kite surfing.



  • Associate Broker

  • Multi-Million Dollar Producer

  • Member Southwest Board of REALTORS*

  • Member Michigan Association of REALTORS*

  • Member National Association of REALTORS*

  • Silver Life & Gold Life Award Recipient


  • Volunteer for Hospice at Home

  • South Haven Chamber of Commerce Ambassador

  • Member or AAUW

  • Member of American Legion


  • Master of Arts in Exercise Physiology, WMU

  • Bachelor of Science in Exercise Physiology, WMU

  • Accredited Buyers Representative (ABR)

  • Relocation Certified

  • GRI Graduate

  • Resort & Second Home Property Specialist (RSPS)

  • Featured on HGTV's Lakefront Bargain Hunt


HGTV's Lake Front Bargain Hunt

"Serenity in South Haven"

Amy O'Sullivan helps Chicago's Alex and Brennan find their dream home away from home


Kate Muszkiewicz business card


I work 9-4p on Monday, Wednesday, and Friday and am happy to take a quick call, text, or email on days in between. Thanks! -Kate