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The Porsche of the Fox Valley Team

Our Porsche Team

Let us introduce you to our staff, show you some of our special vehicle offers and take you through our complete line of new, Certified pre-owned and used inventory. We can help you find exactly what you are looking for.

We know your time is valuable. We are sure you will find our site a fast and convenient way to research and find a vehicle that's right for you. If we can be of any assistance while visiting us online, send us an email and we will promptly reply.We look forward to serving you!



Dennis Madercic

Dennis Madercic | Dealership General Manager



Phone: 920.968.5600 • Email:

James Zingsheim

James Zingsheim | Porsche Brand Ambassador - Brand Manager

James has been with Bergstrom Automotive for eight years after moving back to Wisconsin from New York City. He is dedicated to and prides himself on building a lifelong relationship with guest.  When not at Porsche of the Fox Valley he enjoys spending time with his family and friends, his Olde English Bulldogge (Tank), collecting sports memorabilia, and attending sporting events.

James' Favorite Porsche: 911

Phone: 920.968.5606 • Email:

Nick Halfman

Nick Halfman | Porsche Brand Ambassador

Nick joins Porsche of the Fox Valley with over 20 years of experience building lasting relationships with his guests. He takes pride in finding the right fit for each guest.

Nick enjoys snowmobiling with family and friends in the northern Wisconsin. 
When the snow has melted he can be found taking long drives on winding roads with his wife.

Nick is also a big Badgers sports fan...  On Wisconsin!
Favorite Porsche: 911 RSR

Phone: 920.968.5600 Ext. 5605 • Email:

Jordan Boyea

Jordan Boyea | Porsche Sales Professional

Jordan joined Porsche in Spring of 2017 after graduating from the University of Wisconsin Oshkosh.  He enjoys building relationships with his guests and providing the best experience possible.  In his free time he enjoys lifting, running and being outdoors.


Favorite Porsche: 2018 Panamera Turbo 


Phone: 920.968.5600 • Email:

Andy Potts

Andy Potts | Porsche Parts Manager

Andy has been in the automotive industry for 16 years.  Porsche represents a new and exciting time of his career since transitioning from Domestic brands.  When not at Porsche of the Fox Valley, Andy enjoys watching and playing baseball, football and tennis and traveling with his wife and son.

His favorite Porsche line is the Macan

Phone: 920.968.5600 • Email:

Austin Croatt

Austin Croatt | Porsche Parts

Austin Croatt has 5 years experience in both sales and parts. An elite team already, Austin was the perfect addition to our flourishing Porsche family July 2015. His team mates enjoy working with him and his inventive solutions. With his "get it done" and "what's best for the guest" attitude, it's no surprise why Austin is recognized by Bergstrom Automotive as one of their top parts consultants. His reliability, sense of urgency, helpfulness, and genuine personality, are the reasons why people ask for him by name. Austin has a drive for excellence, a passion for Porsche, and is committed to taking great care of our parts guests.

He enjoys working at Porsche of the Fox Valley and the challenges it brings. In his free time, Austin enjoys mountain biking, bowling, and watching the Packers. His favorite car is a 1996 Porsche 911. He loves to travel and has visited Brazil, Bahamas, and Mexico!

Austin joins Porsche of the Fox Valley on their "Quest to be the Best." After all, there is no substitute.

Phone: 920.968.5600 • Email:

Keith Gilbertson

Keith Gilbertson | Porsche Service Manager

Keith Gilbertson is a graduate of Universal Technical Institute and Georgia State University. He has 16 years in the automotive industry with BMW. Keith is an avid racing fan, both as a driver and as a spectator. He enjoys delivering the best service experience to Bergstrom guests every day. When not at Porsche of the Fox Valley Keith enjoys spending time with his family, traveling and music.


Favorite Porsche- 911


Phone: 920.968.5600 • Email:

Andrea Thompson

Andrea Thompson | Porsche Service Advisor

Andrea has been in the automotive industry for 9 years.  She has worked with the Domestic brands since 2009 but wanted a challenge which in 2018 she became a part of the Porsche family.  Andrea strives to deliver the best guest experience.  When she is not at Porsche of the Fox Valley, Andrea enjoys being outdoors boating, hunting, just to name a few as well as spending time with her daughter Kelsei and her two dogs Kendel & Kingston.

Favorite: Porsche: Cayenne Turbo S

Phone: 920.968.5600 • Email:

Mike Vander Werff

Mike Vander Werff | Porsche Master Technician

Mike grew up in the racing world and has had Porsche in his veins his entire life. He has been with Porsche of the Fox Valley for 13 years.

Phone: 920.968.5600 • Email:

Jordan Phillips

Jordan Phillips | Porsche Technician

“Porsche is precision.”

Jordan graduated from Universal Technical Institute and pursued the Porsche brand as soon as possible.  He has been with Porsche since 2015 and has loved every second of it.  When not with Porsche, Jordan enjoys spending time with friends and family, producing music, and helping others.

Jordan’s favorite Porsche is between the Porsche Carrera GT and the Porsche 959.

Phone: 920.968.5600 • Email: