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
    Internet Department
    (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 29 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
    Vice President / General Manager
    (920) 921-0850

    Joel Zerbel

    Joel is Vice President / General Manager 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

  • 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!

  • Sandy Balson
    (920) 921-0850

    Sandy has been the Receptionist at Summit Automotive for the past 5 years. She loves being able to talk to people from all over the country. Sandy and her husband Bruce have been married for 27 years and have three grown children. In her spare time she enjoys reading and being with her amazing family!

  • Randy Sabel
    Business Manager
    (920) 921-0850

    Randy Sabel

    Randy has been the Finance Manager at Summit Chrysler Dodge Jeep Ram for the past 15 years.
        He grew up in St. Peter and has lived in Lomira since 1997. He is married to Dayna and they have two children, Colin and Carly.
        When he is not at work, he is watching the kids in their sporting events. If he is not there, he is on the golf course!
        Come see Randy for all your finance needs!

  • 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.    

  • 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!

  • Brett Schmitz
    Inventory/Media Marketing Manager
    (920) 397-0783

    Brett Schmitz

    Brett handles the website and all inventory on the used end including pictures and videos of all the used inventory.  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 is dedicated to providing most accurate information on your vehicle before the purchase and providing excellent customer service before, during and after the sale.  In his spare time he enjoys spending time with his wife Ashley and their twin boys David and Taylor.

  • 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!

  • Sean Smith
    Product Specialist
    (920) 921-0850

    Sean Smith

    Sean has been in the automotive industry since 1994 and has a strong background in the technical end of vehicles.
        Born and raised in Fond du Lac, he enjoys time with his wife, Marrissa and their 3 kids.  He also enjoys hunting and fishing.

  • 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!

  • Michael Berg
    Product Specialist
    (920) 921-0850

    Michael Berg

    Michael was born and raised in Fond du Lac and has been at Summit Automotive for 7 years. He is very customer focused and will provide you with an excellent car buying experience! He enjoys watersports, playing the drums and going to concerts!

  • Jake Roberts
    Product Specialist

    Jake Roberts

    Jake loves to sell cars.  He lives in fond du lac with his wife and son. Jake has been in automotive sales for over 8 years. In his free time enjoys watching football and hanging out with the family.

  • 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

  • Dan Tinsley
    Product Specialist

    Dan is United States Army Veteran and has a background in Nonprofit Management, Fundraising, and Business Strategy. He is originally from California and relocated to Fond Du Lac upon retirement from the military. He enjoys working with people and is dedicated to the customer experience. In his free time, Dan enjoys riding his Harley Davidson, attending charity events to support the local community, and spending time with his three dogs. To reach Dan, please call 920-579-4291 or send him an email at

  • 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.

  • Lori Heisler
    Fixed Operations Director
    (888) 736-9559

    Lori Heisler

    Lori was born and raised in Fond du Lac. She has been in the automotive business for 37 years. Lori joined the great team at Summit Chrysler Dodge Jeep Ram in 2008. She is married and has 2 amazing children. In her free time, Lori enjoys spending time with her family, reading, bicycling and working in her yard.

  • 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 Lauersdorf
    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
    Assistant Service Manager

    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.

  • Paul Sieloff
    Service Advisor

    Paul has over 30 years in customer service and 15 of those years in the automotive servicing and aftermarket parts field.  Paul has 3 adult daughters and son in high school.  In his free time Paul enjoys watching his son on the varsity football and track events along with boating, camping and cooking!

  • Tyler McCarthy

    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.

  • Julia Miller

    Julia a passion for vehicles and in her free time she enjoys working on and learning about her jeep, painting, hiking and camping with friends.

  • Tanya Yahr
    Warranty Administrator

    Tanya was born and raised here in Fond du Lac! She loves spending time with her husband Jason and her sons! She also enjoys watching her son play basketball in the winter and being outdoors in the Summer.

  • Ann Hargreaves
    BDC Specialist

    Anne has a diverse professional background and started her career at Summit in 2017. She is the BDC Specialist for the Service department; answering calls, scheduling appointments, making follow-up calls as well as a variety of other responsibilities to help keep the Service department moving along. 

    Anne was born and raised in Appleton, WI and moved to Fond du Lac in 2005. She enjoys spending her free time outdoors during the warmer months gardening and traveling; to hike and explore the beautiful outdoors with her family. When the warmth disappears, you will find her immersed in a book, writing, drawing or just doing anything that stimulates her creative imagination.

  • 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! 

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