Our Agency

Nick Mangini

Founder of Medicare Sharks

Nick Mangini, founder of Medicare Sharks, is originally born and raised in Westchester, NY where he was a standout Collegiate Baseball Player and Coach and earned a Business Management Degree and Master’s Teaching Degree. Nick is also a former Palm Beach County High School Athletic Director and Educator prior to opening a family-owned insurance agency with his wife, mother and friends. With his unique background as a teacher and coach, Nick brings the same educational approach to the Medicare insurance world. Instead of confusing jargon and sales tactics, he focuses on educating clients about their health insurance and Medicare Supplement (Medigap) options, so they can make confident and informed decisions about their coverage.

After seeing how overwhelming and confusing Medicare can be, Nick transitioned into the insurance business to make a difference and be an advocate for his clients. Drawing on his leadership experience in athletics and education background, he built Medicare Sharks into a family-run, five-star rated Medicare insurance agency in Palm Beach County to educate clients who are turning 65 and older. Today, Medicare Sharks proudly serves clients locally in Florida and nationwide, specializing in Medicare Supplement Plans like Plan G, Plan N, and High-Deductible Plan G (Plan HDG), as well as providing clear guidance on the differences between Medigap and Medicare Advantage.

Nick also has expanded Medicare Sharks into helping under-65 age clients find affordable health insurance for individuals, families, especially for those who are self-employed and small business owners. Through his own personal experience, finding affordable health insurance through the ACA-marketplace (Obamacare) was almost non-existent, but Nick was able to secure great coverage through an association-style Cigna PPO plan for his family, and reduced his premiums in half!
Nick’s mission has always been simple: treat every client like family. By providing honest, trustworthy, personalized Medicare guidance, free plan comparisons, and lifetime support, he ensures that people have the freedom to choose their doctors, control their healthcare costs, and enjoy peace of mind in retirement.

When Nick isn’t working with clients, he is spending quality family time with his wife and kids, enjoying South Florida. Nick still volunteers as the baseball coach for St. Vincent School in Delray Beach and he is also a faithful Christian and volunteers at Christ Fellowship Church. Whether it’s mentoring new agents or helping families navigate healthcare choices, his passion for education, service, and community is at the heart of everything Medicare Sharks represents.

Rosemary Mangini

Independent Insurance Agent at Medicare Sharks

Rosemary Mangini is a former New York City educator with over 40 years of teaching experience who brings her passion for education and service into the Medicare insurance world. After she and her husband turned 65, Rosemary quickly realized just how overwhelming and confusing the Medicare system could be. That personal experience inspired her to transition into the Medicare industry with the goal of helping other seniors navigate their health insurance options with confidence and clarity.
As both a Medicare client and advisor, Rosemary provides a unique perspective. She and her husband personally chose a Medicare Supplement Plan (Medigap) and have experienced firsthand the benefits of the coverage—predictable costs, nationwide access to doctors, and peace of mind with healthcare expenses. This allows her to not only explain the value of Medigap coverage but also share real-life examples of how it works in practice.

At Medicare Sharks, Rosemary is a trusted resource for clients, offering education-first guidance, personal experience, and compassionate support to those navigating Medicare for the first time. Her background as a lifelong educator helps her simplify complex Medicare topics and empower clients to make informed decisions that fit their healthcare needs and retirement goals.

Whether she’s working with individuals in Palm Beach County or helping people across the country, Rosemary’s mission is the same: to add value, reduce confusion, and make the Medicare journey easier for every client she serves. When Rosemary is not working with clients, she is spending time with her husband and her family, loving on her grandchildren and volunteering at Christ Fellowship Church.