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  • Meet the Team


  • Having Fun is important for our team. When you enjoy the people you work with and the environment you work in, it’s much easier to focus your passion towards serving and improving our customer service and making people smile.


    Keith Nissen

    Owner & Veteran

    Keith is our leader and owner of Master Services. For over 30 years this dedicated Veteran and Master Plumber has serviced the Lake Geneva area offering 100% guarantees that no other company in the area offers. Keith is proud of his team and strives to provide his customers with the very best trained technicians and customer service available in the industry. Keith is also our Master Plumber and holds and HVAC Expert license. He loves to fly and also loves to spend time with his wife Mary, mom Toni, and his favorite dog Dudley.

    Mary Nissen

    CEO and Owner

    Mary has over 30 years of leadership and Operations experience. She has a proven track record in management and leading teams to success while improving and exceeding customer expectations. Mary is one of the owners of Master Services and CEO and Mary also owns her own company Master SOULutions that offers Success Consulting for businesses and personal Life Coaching for individuals for transformation and achieving goals and dreams. Mary has performed many roles in management in Master Services and looks forward to more involvement in the community and growing services to offer our customers that add value and solutions that work! Mary values family time the most and her most precious role is that of grandmother to her 2 beautiful granddaughters and loving wife and mother.

    Jordan Brown

    GM Operations

    Jordan Brown is the General Manager and Sales Manager for Master Services Plumbing Heating and Cooling. Jordan loves the outdoors and anything to do with water. He has a proven record of developing highly skilled teams that are customer service focused in exceeding customer expectations.

    Serhij Duford


    Serhij is the Operations Manager for Master Services Plumbing, Heating and Cooling. He has a proven track record in leading highly skilled teams with a focus on customer satisfaction. He lives our company core values and delivers on 100% customer satisfaction. He is recently married in the last year and values his family time.

    Ed La Barre

    Plumbing Technician

    Ed is a Master Plumber and has been in the services business for over 33 years including owning his own business. He is also known as Mr. Ed, yes named after the horse of course. He has a beautiful family and strives to improve himself through ongoing education sharpening his skills. He recently moved from northern Wisconsin to the Elkhorn area.

    Eric Nowak

    Plumbing Technician

    Eric is a highly skilled and trained technician in plumbing and HVAC. He has over 10 years experience in customer service and leadership. He is a dedicated father and loves fishing and football. He loves to make customers happy and exceed customer expectations. Eric is trained in first aide and CPR certified. Eric is also certified in IAQ.

    Dan Wenger

    Plumbing Technician

    Dan is a trained and highly professional plumbing technician with years in the service industry. Dan is certified in first aid and CPR. Dan has a lovely wife and infant baby girl. He looks forward to his family time and rest.

    George Schutte

    HVAC Installation Tech

    George is a highly trained and skilled technician. He is our safety coordinator and trained in first aid and CPR. George is a team and customer Hero who recently saved the life of one of our customers in Home Depot. He is a loving husband and loves to make people smile. George is our wiring expert and is also trained on IAQ.

    Jack Schweder

    HVAC Installation Tech

    Jack is a highly trained HVAC technician and a comfort advisor. He is trained in IAQ and is also certified in first aid and CPR. He is a loving father to a beautiful little girl name Peyton and when he is not working you will find him fishing on the water with his brother Brian.

    Joe Madary


    Joe has 2 children and loves coaching his son in baseball. Joe loves to fish and restore his 1951 Chevy truck. Joe has over 12 years in the service industry and has his HVAC install certification.

    Jeff Roepenack


    Jeff has over 20 years’ experience as a residential HVAC installer and service technician. He prioritizes family time and puts a focus on bringing happiness and success to his home and work family. He believes in building long standing relationships with everyone he meets. He has a lovely wife Shawna and two beautiful daughters.

    Tim Willis


    HVAC installer apprentice with several years of customer service. Tim was a all-conference running back and middle linebacker. Father of two beautiful girls and married to a beautiful wife of 2 years. Tim is looking forward to becoming a master of his trade.

    David Mayerck

    Installation technician

    David served 11 years in the Air Force and 6 deployments with multiple awards. He has been trained in his new career as an installer for HVAC. His goal is to become a Master Lead Installer, travel to all 50 states and loves spending time with his children.

    Gary Perret

    Comfort Advisor – Sales

    Gary has over 10 plus years in customer service and as a Real Estate Broker. He went to school in Wilmot and is looking to buy a home and settle in the Lake Geneva Area.

    Chris Shike

    HVAC Technician

    Chris has over 15 years of HVAC experience with a specialty in Power Plants. Chris is served in the Army National Guard. Chris has many years of leadership experience. Chris has a lovely family and wife Valerie and 2 great children. Chris is a handyman and loves to travel.

    Thomas McGrath

    HVAC Technician

    Thomas has great customer service skills and knowledge in foundation repairs and construction management. He also has a black belt in Tae – Kwan – Do. Thomas can sing you your favorite show tune and dance a little too. Thomas loves to make you smile and is very detailed at his job.

    Chelsey Dooner

    Lead Dispatcher Coordinator

    Chelsey is our Lead Dispatcher Coordinator. She has been with the company for over 3 years and is our smiling voice over the phone. She has two handsome young boys and her family is her greatest pride. Chelsey’s goal is to provide the best customer experience to our customers and team possible. She is a powerhouse!

    Bridgette Kramer

    Purchasing and Warehouse Coordinator

    Bridgette is our Purchasing and Warehouse Coordinator. Bridgette has over 10 years’ experience in a purchasing role. Bridgette has two beautiful daughters and has a goal of a beautiful home in the near future. Bridgette does an awesome job ordering everything from equipment to office supplies to gifts for vendor shows. Bridgette your awesome and we appreciate you!

    Penny Skerhutt

    Administrative Financial Specialist

    Penny has over 25 years’ experience as an accountant in both public and private sectors. Penny is our AFS or Administrative Financial Specialist. Penny is also and avid exerciser, marathon runner and motivates our team to eat right. Penny and her husband have a new puppy and love to camp and fish. Penny loves to relax and enjoy life after a hard days work.

    Katie Smosarski

    Customer Services

    Katie has been in customer services over 25 years and with Master Services for a little more than a year. Katie’s smile and laugh are contagious and our customers love her. Her greatest accomplishments are her 3 lovely girls and her finance Eric. Katie is a great planner and leads many projects in the office. Katie assists with most administrative tasks and leads the call center in results. Way to go Katie!


    King of Comfort

    Dudley is the new King of Comfort. He quickly won over our customers and loves the be petted. Dudley comes to work every day and puts a smile on all the faces at the office and our customers who visit us. Dudley is also a service dog and loves to go to vendor shows, fairs and special occasions. He loves his treat and is always willing to play fetch.