NEWPORT, RHODE ISLAND - October 6, 2025 - SERHANT., the globally recognized luxury real estate brand, has officially expanded into Rhode Island, marking its first footprint in the state. The launch brings together some of Rhode Island’s top-performing agents and teams, including six founding agents, plus more than 30 agents total, whose collective sales volume within the last twelve months exceeds more than $550 million. This marks the third new market entry for SERHANT. in 2025 to achieve that milestone. The firm will open an office in Downtown Newport in early 2026.
The founding agents for SERHANT. Rhode Island include: John Sheil, Allie Readyhough, Dina Karousos, Tammy Bass, Devin Sheehan, Caroline Richards and Hillary Olinger. The market is led by Debroah Hauser.
Sheil Readyhough Team
The Sheil Readyhough Team joins SERHANT. Rhode Island with more than 60 years of combined experience and a track record of record-breaking transactions across the state. Led by Johnny Sheil and Allie Readyhough, and including Jay Readyhough, Monica Boss, Erin Marsh, and Charlotte Fiola, the team previously operated with Mott & Chace Sotheby’s International Realty. The team has achieved a total career sales volume of $512 million, including $95 million in the past 12 months, with $64 million closed year-to-date in 2025.
The team has earned recognition for their high-impact deals and top-tier performance. In 2024, they were ranked #6 in Rhode Island for sales volume and #8 for transaction sides by Real Trends. Additionally, Erin Marsh closed the highest residential sale in North Kingstown at $9.75 million, more than $5 million above the next highest sale.
“Having built our foundation with a respected brand, we’re excited to start a new chapter fueled by fresh energy and possibility,” said Johnny Sheil and Allie Readyhough. “SERHANT. offers the perfect blend of innovation and support, allowing us to keep serving our clients at the highest level while embracing growth and change. This move just feels right for where we’re headed next.”
Dina Karousos
With 15 years of experience, Dina Karousos joins SERHANT. Previously with Gustave White Sotheby’s International Realty. Dina closed $68 million in 2024 and has achieved more than $435 million in career sales.
Dina has been consistently ranked among the top agents statewide, including: #1 agent at Gustave White Sotheby’s (2025), Top Producing Team in Portsmouth, RI (2019–2025), Top 1% of Rhode Island agents (2020–2025). Her notable transactions include the record-breaking $8.55 million sale of 179 Indian Avenue in Portsmouth.
Outside of real estate, Dina is a restaurateur and co-owner of the iconic Blue Plate Diner, which she has operated with her husband for 22 years.
Tammy Bass
Tammy Bass brings more than 23 years of experience in the Rhode Island real estate market to SERHANT. Previously with Hogan Associates Christie's International, Tammy has closed over $700 million in career sales, including $55M+ from September 2024 to September 2025. Recognized as the Number One Agent at Hogan Associates Christie's International for the past four years, Tammy has also been a Master's Circle Class Member for Christie's International in 2023, 2024, and 2025.
“I wanted to be part of a company with an upward trajectory—one that puts growth and progress at the heart of everything it does. SERHANT.’s mindset for success means constantly evolving and always finding new ways to serve clients better. Opportunity means seeing what others miss, and going after it without hesitation to turn vision into results. This is a company that doesn’t follow trends; it sets them. I’m proud to bring that level of innovation, drive, and forward-thinking energy to my clients and to the Rhode Island market,” said Bass.
Devin Sheehan
Devin Sheehan brings more than 11 years of experience in the Rhode Island real estate market to SERHANT. Previously with RE/MAX, Devin has closed over $114 million in career sales, including $12 million in 2024 and $17 million in 2025. His notable transactions include the sale of 299 Switch Road in Richmond, the third-highest single-family sale ever recorded in the town.
Recognized as a Top 40 Under 40 agent with RE/MAX for the past two years, Devin has also achieved Platinum Status within the RE/MAX network three times (2021, 2024, and 2025).
“My goal was to align with a world-class luxury brand that embodies excellence, innovation, and distinction. Partnering with such a highly regarded brand will significantly elevate my position within the luxury real estate market,” said Sheehan.
Caroline Richards
Caroline Richards joins SERHANT. with more than 12 years of experience in Rhode Island real estate, most recently with Hogan Associates/Christie’s International Real Estate. She has closed more than $120 million in career sales, including $12 million in the past year alone. A recipient of the RI Monthly Excellence in Real Estate Award, Caroline is recognized for her deep market expertise and strong client relationships across Newport and beyond.
Prior to real estate, Caroline worked as an investment banker in New York City, a background that gives her a distinct edge when advising investors and high-net-worth clients. Highly active in the community, she serves on multiple local boards and is passionate about giving back.
“I’m inspired to join a brokerage that isn’t just keeping pace with the industry, but actively reshaping it—setting a higher standard of innovation, service, and experience for both agents and clients,” said Richards.
Hillary Olinger
Hillary Olinger joins SERHANT. with more than a decade of experience representing clients across Rhode Island. Previously with Hogan Associates/Christie’s International Real Estate, Hillary has closed over $70 million in career volume across 120+ transactions, including $12 million in the past year alone.
A Zillow Premier Agent with a perfect 5.0 rating and verified 5-star client reviews, Hillary has also completed multiple exclusive off-market transactions and represented high-value properties across Newport, Barrington, Portsmouth, Middletown, South County, and Bristol.
“Choosing SERHANT was about aligning with a culture that values both innovation and people. SERHANT’s collaborative energy, technology, and unmatched marketing reach allows me to give my clients every possible advantage,” Olinger said.
Agents who have joined SERHANT. Rhode Island include: Alex Nunes, Allie Readyhough, Amanda Londono, Ben Thomas, Ben Willet, Caroline Richards, Catherine Sousa, Christopher Palm, Colleen Hagarty, Devin Sheehan, Dina Karousos, Dominique Frazier, Eddy Grijalva, Elizabeth Enochs, Ellen Oaklund, Emma Parker, Giovanna Boscia, Hilary Olinger, Holly Prentice, Jenny Palm, John Sheil, Jordan Ross, Kelsey Martin, Lea Savas, Lindsey Duckworth, Nicole Lucenti, Nicole Parente, Roger Duques, Stephanie Basile, Tammy Bass, and Todd Sherman.
Founded in 2020 in New York City, SERHANT. has quickly become one of the fastest growing and top-ranking real estate firms in the nation, with more than 1,100 agents and 100 full-time team members. SERHANT. first expanded outside of New York in 2023 and now operates in Arizona, Connecticut, Florida, Georgia, Maryland, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, Virginia, and Washington, D.C. The firm continues to redefine the real estate landscape by combining innovative marketing, cutting-edge technology, and dynamic media strategies.
SERHANT. sets itself apart with a forward-thinking, agent-first model: it teams up with top talent rather than acquiring agents or brokerages, identifying a strong principal in each market and builds around them with high-performing agents who align with its values. With a “people first, culture second, sales volume third” philosophy, SERHANT. is focused on long-term success and sustainable, community-driven growth, with innovation at the core of its DNA. From its proprietary AI platform, S.MPLE, to its in-house creative agency ID Lab, to in-house content creation and media production through SERHANT. Studios, SERHANT. enables agents to scale their business, reach wider audiences, and elevate the client experience in ways traditional brokerages can’t match.
About SERHANT.
SERHANT. is a multidimensional real estate and media company designed for the marketplace of tomorrow. The company grew from the #1 ranked sales team in New York City into a full-service brokerage, digital education platform, and creative film studio that develops content for social, sharing and streaming. This model is revolutionizing the real estate industry and transcending it to the tech, media, education, and entertainment industries. The SERHANT. real estate brokerage operates in Arizona, Connecticut, Florida, Georgia, Maryland, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, Virginia, and Washington, D.C.with more than 1,100 agents, and includes residential real estate and specialty divisions SERHANT. Signature, focused on high net-worth clientele and properties priced over $10 million USD, and SERHANT. New Development, focused on the sales and marketing of new construction projects, complete with its complementary ID Lab which forms the brand identity and marketing for developments. SERHANT. Studios, its full-service film studio and production division, concepts and distributes all content from social assets to the streaming channel LISTED on YouTube. SellIt.com, the global digital education and innovation arm of the company has more than 30,000 members across more than 125 countries. SERHANT. was founded in September 2020 by top real estate broker Ryan Serhant, with a commitment and vision to amplify the success of others: executives, brokers, developers, clients, global course members, and the industry as a whole. Learn more at serhant.com.