Meet our Team of Automotive Specialists

We are proud to introduce our award-winning team of experts. Whether you’re looking for your dream car or are stopping by to browse, we appreciate you taking the time to shop with us. No matter what brings you to our beautiful showroom, you can count on experiencing the VIP customers service you deserve every time you visit us. We look forward to seeing you soon.

Dennis Madercic
Dealership General Manager
James Zingsheim
Porsche Brand Ambassador - Brand Manager

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

James' Favorite Porsche: 911 Turbo S

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

Gabriele Mazzotta
Porsche Sales Professional

Gabriele Mazzotta was born in Danbury, CT and raised in Jacksonville, NC till December of 2014. He started the automotive industry in the summer of 2013 after graduating. He started with Bergstrom Automotive March of 2015 and worked his way to Bergstrom Porsche of the Fox Valley, March of 2018. Gabe’s number one concern is to make guests feel at home and treat them like his own family members. Gabe loves the outdoors, traveling around the world and being with family or friends as much as he can. He has a 5 year old Siberian husky (Dexter) that's his world and wouldn't trade him in for anything. 

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

Chris Sprotte
Porsche Parts
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

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.

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.

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