ONE Sotheby's International Realty Executive and Leadership Team

September, 2026

Leadership Overview

ONE Sotheby's International Realty has 7 executives leading key functions including strategy, luxury brokerage, development, sales, and regional operations.

Dedicated to excellence in luxury real estate, ONE Sotheby's International Realty delivers unparalleled market expertise across Florida's East Coast while maintaining a commitment to high-end development opportunities.

Leadership Roles at ONE Sotheby's International Realty

  • Founder & Chief Executive Officer - Mayi de la Vega
  • Chief Executive Officer The Elmir Group - Karen Elmir
  • Chief Executive Officer & Managing Director - Maura Brassil
  • Chief Executive Officer & Founder - Mayi De
  • President & Chief Executive Officer - Daniel Vega
  • President, Jersey Brokerage - Aileen Konzelmann
  • Chief Sales Officer - Seth Kaufman
  • Mayi de la Vega - Founder & Chief Executive Officer

    Mayi de la Vega, the Founder & Chief Executive Officer at ONE Sotheby's International Realty, directs the overarching strategic vision for the firm. Overseeing the expansion of luxury real estate portfolios, the Founder & Chief Executive Officer ensures alignment with high-net-worth client expectations across the Florida East Coast market. This leadership role involves cultivating exclusive partnerships with global developers to secure premier property listings. By driving brand growth and operational excellence, Mayi de la Vega directly impacts the competitive positioning of the company. The Founder & Chief Executive Officer maintains rigorous standards for service delivery, ensuring that every transaction reflects the prestige associated with the brand. Through constant market analysis, the Founder & Chief Executive Officer identifies emerging opportunities for growth, solidifying the firm's status as a leader in the luxury sector while fostering a culture of professional excellence and client-centric innovation.

    Karen Elmir - Chief Executive Officer The Elmir Group

    Karen Elmir, the Chief Executive Officer The Elmir Group at ONE Sotheby's International Realty, manages specialized luxury residential sales and high-end property acquisitions. Overseeing the performance of the Elmir Group, the Chief Executive Officer The Elmir Group ensures that all client interactions meet the highest standards of professional integrity. This leadership role involves architecting complex marketing strategies for multi-million dollar estates throughout the region. By leveraging deep market insights, Karen Elmir secures significant market share within the competitive Florida luxury landscape. The Chief Executive Officer The Elmir Group coordinates with internal teams to streamline the closing process for international and domestic buyers. Through meticulous attention to detail and a focus on long-term client relationships, the Chief Executive Officer The Elmir Group drives consistent revenue growth, ensuring that the firm remains the premier choice for discerning individuals seeking exclusive real estate opportunities in the coastal market.
    Karen Elmir

    Maura Brassil - Chief Executive Officer & Managing Director

    Maura Brassil, the Chief Executive Officer & Managing Director at ONE Sotheby's International Realty, oversees daily operational workflows and organizational efficiency. Managing the firm's internal infrastructure, the Chief Executive Officer & Managing Director ensures that all brokerage activities align with corporate objectives and regulatory requirements. This leadership role involves optimizing resource allocation to support the expansive network of agents operating across the Florida East Coast. By implementing scalable business processes, Maura Brassil enhances the overall productivity of the brokerage teams. The Chief Executive Officer & Managing Director collaborates with senior leadership to refine service models, ensuring that the company maintains its reputation for excellence in luxury real estate. Through the oversight of administrative and operational functions, the Chief Executive Officer & Managing Director supports the firm's mission to provide superior development opportunities, ultimately driving sustainable growth and operational stability within the highly dynamic and competitive regional real estate market.

    Mayi De - Chief Executive Officer & Founder

    Mayi De, the Chief Executive Officer & Founder at ONE Sotheby's International Realty, architects the long-term growth trajectory and corporate identity of the organization. Overseeing the firm's strategic direction, the Chief Executive Officer & Founder ensures that the brand remains synonymous with luxury and exclusivity. This leadership role involves identifying key market trends and development opportunities that align with the company's mission to serve the Florida East Coast. By fostering a culture of high performance, Mayi De drives the professional development of the entire brokerage team. The Chief Executive Officer & Founder maintains strong relationships with industry stakeholders to ensure the firm remains at the forefront of the real estate sector. Through the continuous evaluation of market performance and client needs, the Chief Executive Officer & Founder secures the company's position as a premier source for luxury real estate, ensuring that every strategic initiative contributes to the long-term success and market dominance of the firm.

    Daniel Vega - President & Chief Executive Officer

    Daniel Vega, the President & Chief Executive Officer at ONE Sotheby's International Realty, directs the execution of corporate strategy and business development initiatives. Overseeing the firm's expansion into new luxury markets, the President & Chief Executive Officer ensures that all operations remain consistent with the company's high-end service standards. This leadership role involves managing complex development projects and coordinating with regional teams to maximize market impact. By optimizing the sales pipeline and fostering strategic alliances, Daniel Vega drives significant revenue growth across the Florida East Coast. The President & Chief Executive Officer monitors market fluctuations to adjust business tactics, ensuring that the firm remains agile and responsive to client demands. Through the integration of innovative technology and traditional brokerage expertise, the President & Chief Executive Officer strengthens the company's market position, ensuring that the firm continues to provide unparalleled value to clients and stakeholders in the luxury real estate sector.

    Aileen Konzelmann - President, Jersey Brokerage

    Aileen Konzelmann, the President, Jersey Brokerage at ONE Sotheby's International Realty, manages the operational and sales activities within the specific regional brokerage division. Overseeing the expansion of the firm's footprint, the President, Jersey Brokerage ensures that all local operations adhere to the high standards of the brand. This leadership role involves recruiting top-tier talent and fostering a culture of excellence among the brokerage staff. By driving regional market initiatives, Aileen Konzelmann secures a competitive advantage in the luxury real estate sector. The President, Jersey Brokerage coordinates with the corporate office to ensure that regional strategies align with the overall mission of the firm. Through the effective management of local resources and a focus on client satisfaction, the President, Jersey Brokerage drives growth and maintains the company's reputation for providing premier real estate and development opportunities, ensuring that the firm remains a dominant force in the regional market.

    Seth Kaufman - Chief Sales Officer

    Seth Kaufman, the Chief Sales Officer at ONE Sotheby's International Realty, directs the global sales strategy and manages the performance of the brokerage force. Overseeing the implementation of high-impact sales initiatives, the Chief Sales Officer ensures that all agents possess the tools and market intelligence necessary to close complex luxury transactions. This leadership role involves analyzing regional sales data to identify growth opportunities and refine the firm's competitive approach. By mentoring top-tier talent, Seth Kaufman drives the professional success of the sales team and ensures consistent revenue generation. The Chief Sales Officer collaborates with the executive team to align sales targets with the company's broader development goals. Through the application of data-driven strategies and a focus on client acquisition, the Chief Sales Officer strengthens the firm's presence across the Florida East Coast, ensuring that the company remains the premier choice for luxury real estate and development opportunities.
    Seth Kaufman

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    Frequently Asked Questions Regarding ONE Sotheby's International Realty Top Executives and Leadership Team

    Who leads ONE Sotheby's International Realty?
    ONE Sotheby's International Realty is led by Mayi de la Vega (Founder & Chief Executive Officer), along with executives such as Karen Elmir (Chief Executive Officer The Elmir Group) and Maura Brassil (Chief Executive Officer & Managing Director).
    Who is part of ONE Sotheby's International Realty’s executive team?
    The executive team of ONE Sotheby's International Realty includes leaders such as Mayi de la Vega (Founder & Chief Executive Officer), Karen Elmir (Chief Executive Officer The Elmir Group), Maura Brassil (Chief Executive Officer & Managing Director) and other senior executives.
    How many executives does ONE Sotheby's International Realty have?
    ONE Sotheby's International Realty has 7 executives leading key business areas.
    What roles are included in ONE Sotheby's International Realty’s leadership team?
    The leadership team of ONE Sotheby's International Realty includes roles such as Founder & Chief Executive Officer, Chief Executive Officer The Elmir Group, Chief Executive Officer & Managing Director, Chief Executive Officer & Founder, President & Chief Executive Officer.