John Dissen
John Dissen at Hennessy Porsche North Atlanta

John Dissen

Porsche Certified Brand Ambassador

Hennessy Porsche North Atlanta

990 Mansell Rd
Roswell, GA 30076

5.0
114 Reviews

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.

5.0

114 Reviews

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114 Reviews of John Dissen

February 22, 2026

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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 More

by George
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Yes

Other Employees Tagged: Mark Venti, Drew Borges, Michael Caldwell, Emerson Knauss , Matt in parts five stars !!!

January 18, 2026

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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 More

by KEM
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Recommend Dealer
Yes

Other Employees Tagged: Scott Hamilton, Joel Hughes

Feb 10, 2026

Hennessy Porsche North Atlanta responded

Thank you for being such a loyal member of the Hennessy Porsche family. Six Porsche purchases is incredible, and we truly appreciate the trust you’ve placed in John and our team over the years. It’s always a pleasure working with you.

January 04, 2026

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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 More

by Houghgenconsulting
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Yes

Other Employees Tagged: Michael Carvajal

Feb 10, 2026

Hennessy Porsche North Atlanta responded

Thank you for your continued trust over the past several years. It means a great deal to be part of so many special Porsche purchases for you and your family. John’s long term relationships with his clients are something we’re very proud of, and we’re glad Michael helped make the process seamless each time. We sincerely appreciate you being part of the Hennessy Porsche family.

October 23, 2025

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We just purchased our third Porsche from Hennessy Porsche. John Dissen made the whole process a pleasure. They take customer service seriously. More

by smosley
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Yes

October 21, 2025

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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. More

by Tom S
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Recommend Dealer
Yes

Other Employees Tagged: Steve Richardson, Dan Bush, Michael Carvajal , Charlie Edmondson

September 05, 2025

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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 More

by camillerogers11
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Recommend Dealer
Yes

Other Employees Tagged: Michael Carvajal

August 17, 2025

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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 More

by Steven M
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Yes

May 02, 2025

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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 More

by Irish Potatohead
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Recommend Dealer
Yes

Other Employees Tagged: John Sargent

March 24, 2025

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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 More

by joeconsolo
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Recommend Dealer
Yes

Other Employees Tagged: Drew Borges

February 03, 2025

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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. More

by edailey72
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Yes
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