Meet Our Staff

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

  • Matt Weinberg
    (920) 602-2210

    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!

  • Ryan Knueppel
    General Manager
    (920) 921-0850

    Ryan Knueppel

    Ryan has been in the automotive industry for over 14 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 two beautiful daughters that he spends as much time with as possible.  In his free time he loves to golf and fish every chance he gets.

  • Mike Berg
    (920) 921-0850

    Michael Berg

    Mike is CEO 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!

  • 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

  • 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.

  • Mark Phillips
    Used Car Director
    (920) 251-1152

    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 FL since 2006. When he's not at work, he enjoys home improvement projects and of course, golfing!

  • Ryan Mikle
    Used Car Manager
    (920) 948-7539

    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!

  • Andrew Stern
    General Sales Manager
    (920) 921-0850

    Andrew has been in the automotive industry for 15 years. He takes pride in giving each guest a great experience and to make finding your next vehicle enjoyable. He received his bachelor's degree from UW-Oshkosh and is a Titan football alumni. Hail Titans! He enjoys soaking up the sun on the golf course, Wisconsin sports teams, and spending time with family.

  • Katie Luttenberger
    Director of Marketing
    (920) 921-0850

    Katie was born and raised in Fond du Lac, WI. She loves spending time with her dog, friends, and family. When she's not at work she's either attending concerts, thinking of the next place she wants to travel to, or snuggling up with her pup at home. 

    Katie loves being creative and producing content that will help not only Summit but the community as well. For what's happening at Summit be sure to follow our Social Channels!                


  • Jennifer Schaub
    Administrative Assistant
    (920) 921-0850

    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 BrennerTim is the Finance Director here at Summit Chrysler Dodge Jeep Ram. He has 30 years of experience in Automotive Dealerships with 27 of those years as Business Manager. 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 son Riley.

  • Colin Choby
    Business Manager
    (262) 353-0040

    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.    

  • Dave Reilly
    Business Manager
    (920) 921-0850

    Dave has been in the automotive industry since 2004 with most of them as a Business Manager. He is dedicated go above and beyond to make sure your customer experience is positive. When not in the office he enjoys road biking with his wife Jaime, hiking with his dog Bailey and spending time with his daughter (and adventure buddy) Lauren, his son Max and his grandson Asher.

  • Zack Dobrunz
    Finance Manager
    (920) 921-0850

    Zack was born and raised in Appleton, where he grew up in car dealerships. He started as a lot attendant when he was 20 years old. Now he has been a Finance Manager for 2 years. 

    He also spent 6 years in the Air Force Reserves. In his free time, he enjoys hiking with his dog and girlfriend, golfing, and spending time outside. 

  • 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 his wife 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.

  • Jamie Hansen
    Commercial/Fleet Manager
    (920) 579-2921

    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
    (920) 921-0850

    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.

  • Brad Wasieleski
    Product Specialist
    (920) 921-0850

    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.

  • Tommy Vang
    Product Specialist
    (920) 921-0850

    Tommy has 3+ years in auto industry and graduated locally from Fond du lac High School. His off time is spent with his 12 year old son Jhaedyn and family. Tommy is Bilingual and fluent in Hmong and English.  

  • Tom McComb
    Product Specialist
    (920) 921-0850

    Tom is a recent addition to our family at Summit Automotive. He was raised right, as a Green Bay Packers fan despite growing up in CA. His Dad is an Air Force Vet, serving for over 20 years. Upon retirement from the Armed Services, his family moved to Madison, WI where he went to high school. Tom attended UW-Stout for both his BA and MA. Tom loves being able to work, live and serve the Fond du Lac community. He also enjoys hunting, fishing, golf and finding amazing supper clubs across WI. 

  • Jesse Slechta
    Product Specialist
    (920) 238-3966

    Jesse is 25 years old and has been selling cars since he was 19. He is a big car enthusiast - performance cars, trucks, etc. you name it, he probably knows all about it!

    Jesse lived in Australia when he was 3 months old up until he was 7. In his free time he loves spending time with family and being on the lake when he can.

  • Austin Oehlke
    Product Specialist
    (920) 238-3966

    Austin was born and raised in Wisconsin and has been in Fond du Lac the last 10 years. He loves to spend time with his family, friends, and his dogs! His passion is sports and sport cars.

    Austin enjoys some friendly competition, but his ultimate goals is to help his guests achieve their car goals. 

  • Mason Aird
    Product Specialist
    (920) 238-3966

    Mason started at Summit in 2018 as a part time detailer at the age of 16. He lived in Oshkosh for 5 years and then moved to Fond du Lac.

    When Mason is not at work he is usually hanging out with his dog. He also enjoys everything outdoors including Hunting, Snowmobiling, Boating, and Golf. 

  • Michael Marusich
    Product Specialist
    (920) 238-3966

    Michael has been in sales for about 4 years and has loved every bit of it. He loves working with customers to find them the perfect vehicle that fits their needs. 

    In his spare time he enjoys spending time with his daughter who is 1, his wife and two dogs. In the summer months he enjoys going camping up north.

  • Jennifer Preston
    Service Director
    (920) 322-7556

    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 two beautiful granddaughters. In her free time, Lori enjoys spending time with her family, reading, bicycling and working in her yard.

  • Brett Schmitz
    Used Inventory Production Manager
    (920) 397-0783

    Brett Schmitz

    Brett handles the website and all inventory including pictures and videos. Some other duties include network administrator and used vehicle expediter. 

    He is a graduate of the University of Wisconsin Whitewater where he majored in Computer End-User Technologies. Brett began his career in the Automotive Industry full time in 2006. He has a large automobile knowledge spanning many makes, models and years. 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 18.1 million views and over 28,100 Subscribers and gets over 11,000 views a day!  You can check out his 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.

  • Sam Eichner
    Parts Consultant
    (888) 736-9559

    Sam was born and raised in Jackson, WI. He has been in the Automotive Industry since 2012. He went to Moraine Park where he studied Automotive Technology.

    In his free time he enjoys playing cribbage with his girlfriend Patty. He will never pass up a game of corn hole when there is an opportunity. He also bowls in a league in Oshkosh on Friday nights. Sam loves spending time with family, especially with nieces Olive and Margot, and nephew Arrow. 

  • Geoff Kuitert
    Service Writer
    (920) 322-7556

    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.

  • Jesse Zepeda
    Service Advisor
    (920) 322-7556

    Jesse has been in the automotive industry for a year and a half. In his free time he enjoys playing softball, golf, fantasy sports and spending time with his family and friends. 

  • Jace Braun
    Express Lube Advisor
    (920) 322-7556

    Jace was born and raised in Fond du Lac.

    He has been in the automotive industry for 4 years, ranging from express lane, detailing, supervising, and service advisor.

    He enjoys music festivals/concerts, working on his project car, and downhill boarding.

  • Matt Richardson
    Express Lube Advisor
    (920) 322-7556

    Matt was born and raised in Fond du Lac, WI. He has been in the automotive industry for four years with being a technician to now being a service advisor.

    In his free time he enjoys spending time with his family and fiance Sara. If he's not at work he's at the local pond/lake fishing or fixing his car.

  • Brittany Hopkins
    BDC Specialist
    (920) 921-0850

    Brittany is part of our amazing Business Development Team and handles customer communications with our sales team. After growing up in Oakfield, Brittany has spent time living in Oregon, Texas and France. She graduated from UW-Stevens Point with a degree in International Studies, French and Political Science. A fan of traveling, animals, and traveling animals, she enjoys spending time with her husband and son, gardening, off-roading and bird watching. An active advocate for the Fond du Lac area, Brittany is a member of the Board of the Friends of Horicon Marsh Education & Visitor Center and an active volunteer in the community.

  • Crista Lueptow
    BDC Specialist
    (920) 921-0850

    Crista has been in the automotive industry for over 10 years from parts, to service and now apart of the Business Development Team here at Summit. She was originally from the U.P. and then was raised in Beaver Dam and has been in Fond du Lac for over a decade now. Outside of work she enjoys crafts like knitting and cross stitch. Her and her fiancé have 3 cats and a blue heeler puppy named Lola.

  1. Summit Chrysler Dodge Jeep Ram

    815 S Rolling Meadows Dr
    Fond Du Lac, WI 54937-8200

    • Sales: 920-239-3181
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Get in Touch

  • Contact our Sales Department at: 920-239-3181
  • Monday08:30AM - 07:00PM
  • Tuesday08:30AM - 07:00PM
  • Wednesday08:30AM - 07:00PM
  • Thursday08:30AM - 07:00PM
  • Friday08:30AM - 06:00PM
  • Saturday08:30AM - 04:00PM
  • SundayClosed