Click on one of the people below to find out more information.

  • Mike Berg
    (920) 921-0850

    Michael Berg

    Mike is President and owner of Summit Chrysler Dodge Jeep Ram. He started in the car business when his Grandfather, Bill Gores (Founder of Holiday) asked him to wash cars in 1974. He's STILL here!
        Mike and his wife, Nancy have 3 children. He enjoys hunting, boating, paddle boarding and spending time with his family! He's a life long Packer fan who loves going to games!
        Call Mike with any questions or anything he can help you with!

  • Nancy McCullough Berg
    VP/Board Member
    (920) 921-0850

    Nancy Berg

    Nancy has been working at Summit with her husband, Mike, for over 14 years. She and Mike have been married for 32 years and have 3 children!  Nancy enjoys the challenges that the ever changing internet brings and loves meeting the people that contact us from all over the country. "I love that I have made friends from all over. Once people experience our hands on way of doing business, they come back. I have sold many out of town/state people as repeat customers. I think that says a lot for the trust they have in us."

        In her spare time, she loves water-skiing, paddle boarding, boating, hiking, biking, traveling and working out but mostly spending time with her family.

  • Joel Zerbel
    Chief Operating Officer
    (920) 921-0850

    Joel Zerbel

    Joel is Chief Operating Officer at Summit Automotive.  Joel has over 30 years of automobile experience. 

    Joel and his wife Deb have 4 children, Sam, Sarah, Grace and Isaiah and a Golden Retriever Jasper. Deb is a Special Education teacher locally. In his spare time, he enjoys hunting, skiing and spending time  in northern Wisconsin with his family.

    Joel believes it is important to give back to the communities that they serve. He is involved with several local organizations and charities that provide assistance and programs to local children and families in need.  

    A strong belief if his is that you should give back to the communities they serve. Customer service and employee satisfaction are top priorities at Summit. 

    If there's anything he can do for you, give him a call at 920.921.0850

  • Matt Weinberg
    General Manager

    Matt was born and raised in Wisconsin. He graduated from UW Stout where he met his wife.

    After college they spent 9 years in California before moving back to Wisconsin to be close to family.

    Matt enjoys all things outdoors: golfing, boating, sports, hiking.

    Reach out to Matt for anything you might need!

  • Mark Phillips
    Used Car Director
    (920) 921-0850

    Mark Phillips

    Mark has been in the Automotive Industry since 2000. He has an extensive background in trucks. Mark grew up in Oakfield and has lived in FdL since 2006. When he's not at work, he enjoys home improvement projects and of course, golfing! 
        You may contact Mark anytime at 920-251-1152

  • Ryan Knueppel
    General Sales Manager
    (920) 921-0850

    Ryan Knueppel

    Ryan has been in the automotive industry for over 5 years, and has developed a true passion for customer service.  He was born and raised in the Fond du Lac area but also lived in Naples Florida from 2000 until 2010.  While in Florida he mastered the art of true customer service while working for the Ritz Carlton Hotel Group.  He is now married and has a beautiful daughter that he spends as much time with as possible.  In his free time he loves to golf and fish every chance he gets.

  • Ryan Mikle
    Used Car Manager


    Ryan has been in the automotive industry for 9 years.  He was born and raised in the Fond du Lac area.  Ryan has a background specializing in all types of used vehicles, with a true passion for trucks, imports, and specialty vehicles.  He strives in taking great care of our customers and to provide the best car buying experience possible.  In his free time he enjoys being on the water, hunting, golfing, and trying new things that challenge him!

  • Jennifer Berger
    Administrative Assistant

    Jennifer is the voice you hear when you call Summit Automotive.  She has been in customer service for more than 30 years.  She strives to make customers happy and knows a smile goes a long way!  Jennifer grew up in North Fond du Lac and studied Marketing at Moraine Park Technical College.  

    In her spare time she loves to spend with her son and significant other Nathan. She loves to go four wheeling, hiking, biking, trap shooting!

    Jennifer follows the rule of enjoying life and the golden rule.  Treat others the way you want to be treated.

  • Tim Brenner
    Finance Director
    (920) 921-0850

    Tim Brenner

    Tim is the Finance Director here at Summit Chrysler Dodge Jeep Ram. He has 26 years of experience in Automotive Dealerships with 22 of those years in Finance Management. He grew up in  St. Peter and now resides in the Fond du Lac area. When he is not at work, he enjoys spending time with his wife, Tara and 3 children Devon, Dylon and Riley.

  • Colin Choby
    Business Manager


    Colin has been in the car industry for the past 16 years with 9 of those years in the finance department.  He grew up in Lake Geneva and now resides in West Bend.  When Colin is not hard at work getting you the best loan possible he enjoys spending time with his wife and 4 children at home.    

  • Charlotte Bambrough
    Business Manager

    Charlotte has been in the automotive industry for 12 years. Eleven of those years has been spent in the Business office.  When she is not in the office she enjoys hiking and other outdoor activities with her three boys.

  • Chris Olig
    Product Specialist
    (920) 921-0850

    Chris Olig

    Chris has lived in the Fond du Lac area his whole life. He is married to Lisa and they have 2 children, Karly and Kegan. 
        Chris has been in the automotive sales profession for over 22 years.  His "laid-back" attitude has led to great success!
        He has a huge passion for all sports with his favorites being volleyball and golf. He also enjoys hunting, fishing and kayaking.

  • Chris Holmes
    Product Specialist
    (920) 921-0850

    Chris Holmes

    Chris is originally from Boston, Massachusetts having moved to Fond du Lac in 1993. He's been in the car business and at Summit since 1993. He has extensive product knowledge and is our 'go to' guy for today's automotive audio/video systems!

  • Kraig Peterson
    Product Specialist
    (920) 921-0850

    Kraig Peterson

    Kraig was raised in Fond du Lac and spent 5 years in California before moving back. He has been at Summit Chrysler Dodge Jeep Ram for 9 years. He and his wife Kelly are the proud parents of twin daughters, Maeve and Molly!

  • Brock Boettcher
    Product Specialist
    (920) 921-0850

    Brock Boettcher

    Brock has been in the automotive industry since 2008. He graduated from Marian University of Fond du Lac with a degree in Elementry/Middle School Education with a minor in Math and Athletic Coaching. He grew up in Hilbert, WI, and moved to Fond du Lac in 2006. Brock is dedicated to customer service and is a family person. He and his wife, Leah, recently had their second of many children, Jack and baby Lettie! In his free time, he likes spending time with Jack and Lettie, playing volleyball and basketball with his wife Leah.  He also likes drifting and working on his cars!

  • Tim Vande Zande
    Product Specialist


    Tim is from Waupun where he grew up on a family farm.  He has been selling vehicles in the automotive industry for that past 2 years.  Prior to selling vehicles he sold agricultural machinery.  Tim has developed a casual selling style that allows him to patiently help his customers throughout the buying process.  In his free time Tim likes to fish, hunt and spend time with his family and friends.  He can be reached on his cell at 920-517-4820, or shoot Tim an email at TIM@SUMMITAUTO.COM

  • Jamie Hansen
    Commercial/Fleet Manager


    Jamie has been in the automotive industry for 5 years. 3 of which she spent as a sales representative upfitting vehicles from light duty to heavy duty quad axle dump trucks. She has a huge passion for animals. When she is not at work, she is cooking food and spending time with her fiancé(Dustin), son(Brayden) and dog(Malakai). They enjoy taking trips up-north and riding dirt bikes.

  • Marty Krepsky
    Product Specialist

    Marty has been in the Automotive business for over 30 years with an emphasis on customer service and providing a great buying experience. He has experience selling all brands and will make sure you get the type of vehicle best suited to your needs. He has held positions from Sales Manager to General Manager so you can be assured he knows his business and can use that experience to make your visit productive and without hassle. He is very excited about joining the Summit Automotive group because of the friendly atmosphere and customer comes first attitude.

  • Tyler Jackson
    Product Specialist

    Tyler has lived in the Fond du Lac area his whole life. Before recently changing careers into the automotive industry, he did agricultural sales.

    When he's not busy working, he's spending time with his son Greyson. In his spare time, Tyler can be found chasing walleye, sturgeon and whitetails.

    Give Tyler a call today and let him know how he can assist you in finding your next vehicle.

  • Brad Wasieleski
    Product Specialist

    Brad has been involved in vehicle sales for over 20 years.  He spent 25 years in the recreation vehicle industry.  Brand and his wife Christy have two sons Colton and Carson and a yellow lab named Yukon.  Brad enjoys hunting, playing golf, football and spending time with family and friends.  He looks forward to giving the best possible customer service experience at Summit Auto.

  • Jennifer Preston
    Service Manager

    Jennifer is the Service Director of Summit Chrysler Dodge Jeep Ram.  She is new to the Fond du lac community relocating from Minneapolis, Mn. A driven leader working to excel at client experience by building a strong team putting customers at the forefront of the service department. In her free time she loves spending time with her Daughter and family.

  • Lori Heisler
    Parts Director
    (888) 736-9559

    Lori Heisler

    Lori was born and raised in Fond du Lac. She has been in the automotive business since 1977. Lori joined the great team at Summit Chrysler Dodge Jeep Ram in 2008. She is married to Wayne and they have 2 amazing children, Keith, Katie (husband Kris) and a beautiful granddaughter, Claire. In her free time, Lori enjoys spending time with her family, reading, bicycling and working in her yard.

  • Brett Schmitz
    Inventory Manager
    (920) 397-0783

    Brett Schmitz

    Brett handles the website and all inventory including pictures and videos.  Brett also manages the detail crew.  Some other duties include network administrator and used vehicle expediter.  Brett is also the coffee consumption expert at Summit.  Brett began his career in the Automotive Industry full time in 2006. He has a large automobile knowledge spanning many makes, models and years. He is a graduate of the University of Wisconsin Whitewater where he majored in Computer End-User Technologies. Brett grew up in Chilton Wisconsin and moved to Fond du Lac in 2006.  Brett has been with Summit Automotive since 2013 and enjoys the fast pace of the car market and likes the challenges that arise on a daily basis.  He also created and manages the dealership's youtube channel that has over 4.5 million views and over 7,500 Subscribers and gets over 10,000 views a day!  You can check out this channel at Summit Youtube Channel .  Remember to like, subscribe and share.  In his spare time he enjoys spending time with his wife Ashley and their twin boys David and Taylor.

  • Jordan Kollmorgan
    Assistant Parts Manager
    (888) 736-9559

    Jordan is a native of Fond du Lac.  He has been with Summit Automotive since 2013.  He enjoys golfing and going to concerts.  Jordan loves the outdoors when he is not at Summit providing excellent parts customer service.

  • Sarah Ott
    Parts Specialist

    Sarah has 3 years of personal automotive background and has worked specifically in parts since 2016.  She enjoys spending her free time with her friends, spending time outdoors, off roading and working on vehicles.  Sarah is a big gearhead that enjoys anything vehicle related. (Especially Mopars!)

  • Geoff Kuitert
    Service Writer

    Geoff Kuitert

    Born and raised in Fond du Lac, Geoff graduated from UW-Oshkosh in December 2008 and started as the Manager of the Express Lube in January 2009. He has been a part of the dealership since 2000.
        He enjoys playing basketball, golf and a good movie in his spare time.

  • Tyler Gau
    Service Manager / Writer

  • Tyler McCarthy
    Express Lube Advisor

    Tyler started as a detailer and team member in 2014, He enjoys helping others with their cars/trucks and has a deep passion for anything with wheels and an engine. You can find him at the service desk with a big smile ready to help repair or maintain your vehicle. Tyler enjoys hobbies such as driving and working on his car, playing basketball, riding bikes, and being outside with his friends.

  • Gavin Masteller
    Express Lube Advisor

    Gavin was born in Madison and has raised in Fond du Lac.  Gavin has been with Summit since 2018 and loves the interaction with customers he gets daily with making sure your oil changes are getting done quickly and correctly.  He loves working his car and watching sports and movies.  When Gavin is not wrenching on the car he enjoys going on long boat rides.  

  • Rose Grenier
    Administrative Assistant

    Rose grew up in Campbellsport. In 2012 she moved to Ripon where she started her career in the automotive industry. She's excited to have joined the Summit team in 2015! In her spare time she likes to spend time with her young son watching his various sporting activities as well as watching her daughter who competes on an all-star competitive cheer team. When time allows, she enjoys the occasional dinner and a movie with her husband! 

  • Kayla Boersma
    BDC Specialist

    Kayla has been involved in the auto industry for the past 7 years. She grew up in Fond du Lac and attended college at UW-Milwaukee. She has recently joined the Summit Auto Group to lead our Sales and Service Business Development Team. 


    She's obsessed with all things coffee, food, and books - and loves spending her free time with her husband Josh, their 4 boys, and their boxer, Ringo. 

  • Nicole Harmon
    BDC Specialist

    Nicole was raised in Milwaukee and has worked in customer service since graduating from Milwaukee Area Technical College in 2007.  She started her career at Summit in 2019 and is the BDC Specialist for our Sales Division.  Nicole fosters relationships with new customers, follows up with existing customers, supports our sales division and works to ensure every interaction is a great experience. She enjoys summers on the lake, camping with her kids and travels whenever she gets the chance.

  • Alena Lambert
    BDC Specialist

    Alena has been in the Auto Industry for the past two years.  She grew up in Fond du Lac and has a Daughter.  When she is not busy scheduling appointments and making follow up calls to our customers she enjoys spending time with her Daughter and Family.  She also loves coffee and enjoys spending time with her 2 Dogs outdoors.