John Dissen
Porsche Certified Brand Ambassador
Hennessy Porsche North Atlanta
990 Mansell Rd
Roswell, GA 30076
I am an Atlanta native who has worked in the high line automotive industry since 1998 and pride myself on being my client’s trusted resource. Having personally bought over 40 cars, boats, and motorcycles, I consider myself not only an enthusiast but also someone who is familiar with the excitement as well as the apprehension associated with the buying process. My goal is to provide my clients exceptional service in the form of attention to detail, integrity and product knowledge.
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Write a Review114 Reviews of John Dissen
February 22, 2026
It’s getting hard to say anything more positive about this dealership because they always go above and beyond my expectations but I just bought another vehicle this weekend and sure enough the whole expe this dealership because they always go above and beyond my expectations but I just bought another vehicle this weekend and sure enough the whole experience was even BETTER!!! This is how you retain loyal lifelong customers. More
Other Employees Tagged: Mark Venti, Drew Borges, Michael Caldwell, Emerson Knauss , Matt in parts five stars !!!
January 18, 2026
I recently made my 6th Porsche purchase with Hennessy Porsche and John Dissen. The entire process is always efficient, transparent and professional. Along with John, whom we have worked with nearly 20 y Porsche and John Dissen. The entire process is always efficient, transparent and professional. Along with John, whom we have worked with nearly 20 years, the entire team is top notch from finance to service. It is a pleasure conducting business with Hennessy. More
Other Employees Tagged: Scott Hamilton, Joel Hughes
January 04, 2026
My experience with this dealer this past 3 yrs has been excellent. Particularly so with John Dissen throughout the whole process of purchasing my original 911 GTS and my latest 911 4 GTS and my wife's Maco excellent. Particularly so with John Dissen throughout the whole process of purchasing my original 911 GTS and my latest 911 4 GTS and my wife's Macon GTS. Michael Carvajal did a great job with the administrative side. More
Other Employees Tagged: Michael Carvajal
October 23, 2025
We just purchased our third Porsche from Hennessy Porsche. John Dissen made the whole process a pleasure. They take customer service seriously. Porsche. John Dissen made the whole process a pleasure. They take customer service seriously. More
Other Employees Tagged: Scott Hamilton, Mike McPherson, Emerson Knauss
October 21, 2025
I have been working with John Dissen and the team at Hennessey Porsche for 10 years. They have the utmost integrity and always go the extra mile to make sure their customers are delighted. Hennessey Porsche for 10 years. They have the utmost integrity and always go the extra mile to make sure their customers are delighted. More
Other Employees Tagged: Steve Richardson, Dan Bush, Michael Carvajal , Charlie Edmondson
September 05, 2025
I had a wonderful experience buying my new at Hennessy Porsche at the North Atlanta location thanks to John Dissen. John was incredibly patient and knowledgeable, answering all my questions without makin Porsche at the North Atlanta location thanks to John Dissen. John was incredibly patient and knowledgeable, answering all my questions without making me feel pressured at any point. He really took the time to understand what I was looking for and helped me find the perfect car. The entire process was smooth and transparent, making it a stress-free and positive experience. I highly recommend working with John Dissen if you're in the market for a new vehicle. John went above and beyond with my purchase of my new vehicle. John even came in on his day off to assist me on my new vehicle purchase. More
Other Employees Tagged: Michael Carvajal
August 17, 2025
This was my first experience with buying a Porsche, and John made the entire process so easy and smooth every step of the way. From the initial test drive, to the build process, to the final delivery and w John made the entire process so easy and smooth every step of the way. From the initial test drive, to the build process, to the final delivery and walkthrough, he was there to help and worked with me to get exactly what I wanted. He also showed a tremendous amount of knowledge about both the brand and the car. By the end of the process, I didn't really think of him as a salesperson, but more as someone who was partnering with me to help make a dream come true. He really made me feel like part of the family. I've bought cars from other luxury dealers before, but this experience was on a completely different level; much more personalized and pleasant. If you are in the market for a Porsche, I cannot recommend John at Hennessy enough. He has made me a customer for life. More
May 02, 2025
I had a great experience purchasing my vehicle from Hennessy Porsche. John Dissen was a consummate sales professional throughout my experience…easy to work with, communicated well, and guided me throu Hennessy Porsche. John Dissen was a consummate sales professional throughout my experience…easy to work with, communicated well, and guided me through the entire processes from start to finish. When it was time to sign the paperwork, John Sargent was able to make the process smooth and painless. Couldn’t be happier with my experience. Looking forward to doing business with John Dissen and Hennessy Porsche in the future! More
Other Employees Tagged: John Sargent
March 24, 2025
Our experience at Hennessy Porsche was great. John Dissen was nothing short of amazing. Excellent communication through out the process. Delivery experience was as expected for Porsche. They John Dissen was nothing short of amazing. Excellent communication through out the process. Delivery experience was as expected for Porsche. They make you feel special! More
Other Employees Tagged: Drew Borges
February 03, 2025
John Dissen and Hennessy Porsche make buying a Porsche simple and easy. John is very honest and up front with answers to any questions I have had. I feel very comfortable trading with John. simple and easy. John is very honest and up front with answers to any questions I have had. I feel very comfortable trading with John. More

