I refer to myself as Big John. I went to Cal State Fullerton and started in the automotive industry in 1987. I began working at Jim Curley GMC IN 2022. I truly love the car business and consider my co-workers my friends. They are the heart of the dealership. I am originally from Linden, N.J. and have lived in Toms Rivers since 1997 .I lived in California for 6 1/2 years, and my first real job was at Disneyland. That is where I learned that customers always come first. I've been married to my wife Barbara since 1992 and have twins Nick and Kaitlyn. Both college grads and both graduated got their masters in education and business analytics. . I'm proud to say that my wife and my kids are everything to me . My success is their success . It feels great to be with the Curley family . Now 2 great locations! Jim Curley Buick GMC of Lakewood, NJ Jim Curley GMC of Keyport , NJ
Read moreDealership Experience
3 yrs, 8 mos
Industry Experience
39 yrs, 3 mos
Languages Spoken
English
94 Reviews
Write a Review94 Reviews of John Duncsak
April 14, 2026
Dealership was great & I had a very pleasant experience. Everyone was so friendly & went above & beyond to help me. Definitely would recommend to anyone looking for a GMC. And if you do go to Jim Curly Everyone was so friendly & went above & beyond to help me. Definitely would recommend to anyone looking for a GMC. And if you do go to Jim Curly you definitely have to ask for Frank Mazza my salesman. He was the greatest! He went outside & set up my car for me, explained everything to me because between the car I traded in and the 2026 GMC I drove home in it was so different the controls were unbelievable! I needed someone to explain everything to me. Frank was so patient with me and went over everything. I went from a tiny 8” screen to the size of a computer screen and I am still learning how to use it. 😂 But seriously I highly recommend Frank Mazza, he is a gentleman & has patience and knows his cars. He’s your guy! More
Other Employees Tagged: Frank Mazza
April 04, 2026
Everyone was excellent and so helpful! Lauren set up our test drive and stopped by to meet us. Jack was just wonderful, he was so knowledgeable and walked us through the whole process. Joh Lauren set up our test drive and stopped by to meet us. Jack was just wonderful, he was so knowledgeable and walked us through the whole process. John was great too and Damon went the extra mile to get us some great financing. A very honest and customer service -centered dealership through and through! More
Other Employees Tagged: Jack Merwede
April 02, 2026
Cynthia was so helpful in helping us to choose a new car for our growing family! We love our new ride and had a great experience. for our growing family! We love our new ride and had a great experience. More
Other Employees Tagged: Cynthia Rothschild
March 30, 2026
I recently purchased a vehicle here and I have to tell you the experience was great! Dante Pizzi was an awesome. He took the time to explain every detail and answered all of my questions. John was also a you the experience was great! Dante Pizzi was an awesome. He took the time to explain every detail and answered all of my questions. John was also a great person to work with. I appreciate all of their efforts to make it a great experience! Thank you! More
Other Employees Tagged: Dante Pizzi
March 24, 2026
Cynthia and her team were absolutely best, kind, knowledgeable and easy to deal with. Thank you for all your help to get the my first business car signed up, let’s hope there’s more to come. Thank y knowledgeable and easy to deal with. Thank you for all your help to get the my first business car signed up, let’s hope there’s more to come. Thank you again, definitely recommending the dealership and this team to everyone. More
Other Employees Tagged: Cynthia Rothschild
March 07, 2026
Purchasing a new vehicle at Jim Curley GMC was one of the most pleasant experiences we have ever had. Our salesman, Carlos Martinez, was amazing and we highly recommend that anyone visiting the dealership most pleasant experiences we have ever had. Our salesman, Carlos Martinez, was amazing and we highly recommend that anyone visiting the dealership ask for him. He walked us through every feature of the truck from bumper to bumper, and he was incredibly helpful with every question and request we had. We also want to recognize the rest of the team for their excellent work: Lauren and Nicole during the initial internet contact, Carlos and John for their assistance during the test drive and the purchase, and Damen during the financial portion. The prices we negotiated over the phone and via text for both the new vehicle and our trade-in were honored exactly as quoted. We truly appreciate the honesty and accuracy of your team. We highly recommend Jim Curley GMC to anyone looking for a new vehicle. Marc & Mary O. More
Other Employees Tagged: Carlos Martinez , Damen Krone, Nicole Lara, Lauren Rivas
March 02, 2026
Second vehicle leased from Cynthia. Friendly and great experience. Everyone we met knows the vehicles and options they come with. Assistance in setting up the vehicle is outstanding Friendly and great experience. Everyone we met knows the vehicles and options they come with. Assistance in setting up the vehicle is outstanding More
Other Employees Tagged: Cynthia Rothschild, Hank Eisenhauer
March 01, 2026
Friendly and respectful sales and finance team. They took the time to explain all the features in my new truck. They took the time to explain all the features in my new truck. More
Other Employees Tagged: Carlos Martinez
February 21, 2026
What brought me to this dealer was they had the Sierra with configuration closest to my wants and needs. However I would not shop this dealer again. I got the truck I wanted and I’ve moved on so I’ll leav with configuration closest to my wants and needs. However I would not shop this dealer again. I got the truck I wanted and I’ve moved on so I’ll leave it at that. I’m now shopping to replace my wife’s Acadia but will not visit Cynthia at Jim Curley. More
Other Employees Tagged: Cynthia Rothschild
February 10, 2026
Everyone was very kind , especially Carlos & John ! Loved dealing with them all so much my son went a bought a car from them a week later ! Definitely have good pricing ! Loved dealing with them all so much my son went a bought a car from them a week later ! Definitely have good pricing ! More
Other Employees Tagged: Chris Cotten, Hank Eisenhauer, Carlos Martinez

