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


Jack Hanania

If you have any questions, comments, or concerns, feel free to ask Jack by sending him an email.



Stephan Grönberg
Executive General Manager
(678) 622-2731

Born in Mexico City, Mexico. Stephan Grönberg moved to San Antonio, TX with his family in 1990 for a short period of time before becoming a part of the Atlanta, GA community in 1991. Graduating from Woodward Academy, Stephan continued his studies at Clemson University where he would complete a business management degree.  


Stephan began his automotive career in Charleston, SC selling cars and quickly advanced into finance, used car manager and general manger by the age of 26.  With over 10 years of general manager experience in the greater Atlanta area he now resides in Ponte Vedra Beach, FL.  Stephan currently oversees Audi Orange Park, in addition to, the all new state-of-the art Audi Jacksonville located on Atlantic Blvd.  Stephan is committed to better serving his customers with new and used car  inventory as well as vehicle maintenance on all makes and models.

Mark Villella
General Manager - Pittsburgh
(855) 815-8068

Mark Villella is the General Manager at Porsche Pittsburgh. He brings over 15 years of management experience in the luxury automotive industry to the Porsche Brand. A Pittsburgh native, Mark is a graduate of Pittsburgh Technical College and the NADA Dealer Academy. He has received a variety of accolades and awards in automotive sales and management.  Many of these accolades come from his customer-centric focus and commitment to creating an exceptional experience for every customer.  He is open and receptive to new ideas and loves to hear about client experiences firsthand.

*Favorite Porsche: 2019 911 GT3 RS

David Buller
General Sales Manager - Jacksonville
(678) 787-8036

Joe Valasek
General Sales Manager - Pittsburgh

Joe has joined the Porsche Pittsburgh family in February 2020 as the General Sales Manager, and his experience in the luxury car segment has already made a significant impact.  With decades of experience with Audi, Mercedes Benz, and other high-line vehicles, Joe knows what constitutes an exemplary car buying experience and has committed to deliver it to every client.  He is receptive to hearing about every customer's visit  and has a constant motivation to make each one better than the last.

*Favorite Porsche: 1994 Porsche 3.6 Turbo S Flatnose

Andy Medina
Used Car Manager - Jacksonville
(787) 525-6617

My name is Andy Medina and cars and dogs are my passion. I started my career in vehicles more than 10 years ago in San Juan, PR. Born in New York and raised in a fully bilingual, multiracial environment. 

My wife and I share a beautiful blended family with 4 Kids- (let me rephrase 3 teenagers and 1 kid, they would not agree with the term kids anymore). We share our home with our funny looking, snorting Pug named "Who?". 

As the Internet Sales Manager my commitment is to be your first contact. My department is more than prepared and delighted to assist you in finding the best vehicle for your wants and needs. No hassle, no stress, just fair, transparent and enjoyable purchasing experience. I am here to help! 

Brock Koller
New Car Sales Manager - Jacksonville
(954) 856-6982

Evan Driscoll
Internet Sales Manager - Jacksonville
(303) 506-8524

Born and raised in Colorado, Evan started his career as a Police Officer in 2010. After six years of service, Evan decided to follow his passion in cars and began selling them. After being very successful doing so, he was promoted to Corporate Trainer and then Sales Manager.

Evan then decided to relocate to the St Augustine area to be closer to his family and better weather. He is very excited to be a part of the team here at Audi Jacksonville and he looks forward to helping all of our clients find the perfect vehicle. 

Sunny Chaudhry
New Car Sales Manager - Orange Park