ONE Sotheby's International Realty Executive and Leadership Team

October, 2026

Leadership Overview

ONE Sotheby's International Realty has 5 executives leading key functions including luxury real estate strategy, brokerage management, sales operations, and regional development.

Focused on delivering unparalleled service across Florida's East Coast, ONE Sotheby's International Realty maintains a commitment to excellence by connecting discerning clients with premier residential properties and high-value development opportunities.

Leadership Roles at ONE Sotheby's International Realty

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

    Karen Elmir, the Chief Executive Officer The Elmir Group at ONE Sotheby's International Realty, directs high-end residential transactions and luxury market positioning. Overseeing the specialized Elmir Group division, the Chief Executive Officer The Elmir Group manages complex negotiations for elite clientele across the Florida East Coast. This leadership role involves architecting bespoke marketing strategies that highlight unique property assets to international buyers. By aligning team efforts with the broader corporate mission, Karen Elmir ensures consistent growth in market share and client satisfaction. The Chief Executive Officer The Elmir Group maintains rigorous standards for property presentation and transaction efficiency. Through constant analysis of luxury real estate trends, Elmir drives the competitive edge necessary for sustained success in the high-stakes Miami market. This executive focus supports the overall reputation of the firm as a premier source for luxury real estate and development opportunities.
    Karen Elmir

    Maura Brassil - Chief Executive Officer & Managing Director

    Maura Brassil, the Chief Executive Officer & Managing Director at ONE Sotheby's International Realty, governs the operational framework and strategic direction of the brokerage. Overseeing daily business activities, the Chief Executive Officer & Managing Director ensures that all regional offices maintain alignment with the firm's luxury standards. This leadership role involves managing organizational resources to optimize performance across the Florida East Coast. By fostering a culture of professional excellence, Maura Brassil drives the recruitment and retention of top-tier talent. The Chief Executive Officer & Managing Director coordinates with other executive leaders to refine service delivery models for high-net-worth individuals. Through the implementation of advanced operational protocols, Brassil enhances the efficiency of real estate transactions. This executive oversight directly supports the company's mission to provide premier luxury real estate and development opportunities while maintaining a dominant market position in the competitive Florida landscape.

    Daniel Vega - President & Chief Executive Officer

    Daniel Vega, the President & Chief Executive Officer at ONE Sotheby's International Realty, architects the long-term vision and corporate growth strategy for the entire organization. Overseeing the expansion of luxury real estate services, the President & Chief Executive Officer manages the firm's strategic partnerships and development initiatives. This leadership role involves guiding the company through complex market shifts while maintaining the brand's prestige. By prioritizing innovation in property marketing and client engagement, Daniel Vega drives the firm's competitive advantage across the Florida East Coast. The President & Chief Executive Officer collaborates with the board to ensure financial stability and operational excellence. Through the cultivation of high-level industry relationships, Vega secures new opportunities for development and brokerage growth. This executive leadership ensures that the company remains the premier source for luxury real estate, consistently delivering value to clients and stakeholders through a commitment to excellence.

    Aileen Konzelmann - President, Jersey Brokerage

    Aileen Konzelmann, the President, Jersey Brokerage at ONE Sotheby's International Realty, directs the brokerage operations and market expansion efforts within the designated regional territory. Overseeing the local sales teams, the President, Jersey Brokerage ensures that all transactions adhere to the firm's high standards for luxury service. This leadership role involves managing regional growth and identifying new development opportunities that align with the company's broader mission. By fostering strong relationships with local stakeholders, Aileen Konzelmann drives the brand's presence in the market. The President, Jersey Brokerage coordinates with corporate leadership to integrate regional strategies into the national framework. Through the implementation of effective management practices, Konzelmann enhances the productivity and success of the brokerage. This executive focus supports the firm's reputation as a premier source for luxury real estate, ensuring that the company maintains its competitive edge and delivers exceptional results for clients across the region.

    Seth Kaufman - Chief Sales Officer

    Seth Kaufman, the Chief Sales Officer at ONE Sotheby's International Realty, directs the sales force and revenue generation strategies across the Florida East Coast. Overseeing the performance of agents, the Chief Sales Officer implements training programs and sales methodologies that elevate the client experience. This leadership role involves analyzing market data to identify emerging opportunities for luxury property acquisitions and sales. By optimizing the sales funnel, Seth Kaufman directly impacts the company's growth and market penetration. The Chief Sales Officer coordinates with regional leadership to ensure consistent service delivery and brand alignment. Through the application of data-driven insights, Kaufman refines the firm's approach to high-value transactions. This executive focus supports the company's mission by ensuring that every interaction reflects the prestige of the brand, ultimately driving the success of the firm as a premier source 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 Karen Elmir (Chief Executive Officer The Elmir Group), along with executives such as Maura Brassil (Chief Executive Officer & Managing Director) and Daniel Vega (President & Chief Executive Officer).
    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 Karen Elmir (Chief Executive Officer The Elmir Group), Maura Brassil (Chief Executive Officer & Managing Director), Daniel Vega (President & Chief Executive Officer) and other senior executives.
    How many executives does ONE Sotheby's International Realty have?
    ONE Sotheby's International Realty has 5 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 Chief Executive Officer The Elmir Group, Chief Executive Officer & Managing Director, President & Chief Executive Officer, President, Jersey Brokerage, Chief Sales Officer.