Your Leadership Team for San Francisco Real Estate

Jay Costello: President
Eileen Mougeot: Senior Vice President
Jill Gumina: Noe Valley Office Sales Manager
Christine Windbiel: Office Manager for our sales offices
Khoi Vo: Director of Technology
Garey De Martini: Director of Marketing
Lynne Fox: Marketing Manager

Jay Costello

Jay Costello has been active with Hill & Co. since 1980 where he began his career as a Residential Leasing Agent and then Sales Agent. From there, he continued his responsibilities as Sales Manager, General Manager and now, President of the Company. Jay is a native San Franciscan. He graduated from Pomona College in Claremont, California where he was a government major and a 3-year captain of the Lacrosse Team. He has continued his interest in lacrosse and volunteers his time for a number of Bay Area lacrosse programs.
Eileen Mougeot
Senior Vice President 

Eileen Mougeot joined Hill & Co. in 1981. After 20 years as a Top Producer she transitioned to the management team in 2002, when she assumed the position of Sales Manager. In January 2006, she was named Vice President of Hill & Co. Originally from Northwest Connecticut, Eileen attended Simmons College in Boston and the Sorbonne University in Paris. She lived in Paris for three years, where she worked and continued her studies. Eileen is also a Board member of the non-profit organization, Ethiopian Village Schools, which builds classrooms and libraries in rural Ethiopia.
Jill Gumina
Noe Valley Office Sales Manager 

Jill Gumina is the Sales Manager of Hill & Co.’s Noe Valley office. She brings to that position over 25 years of managerial experience in the field of real estate. Previously, she served as President and COO for Coldwell Banker in Southern California overseeing over 1,500 agents. More recently, she was a Sales Manager with Zephyr Real Estate in San Francisco. Jill's goal is to provide exceptional support and counsel to the highly-skilled Hill & Co. sales associates whose integrity and professionalism have no equal. Her dedication and commitment to her agents and their clients have been the hallmarks of her managerial career.
Jill has served as a board member of several nonprofits and once hosted a local cable television program to provide relevant property information to Bay Area viewers.
Her passion and enthusiasm for real estate coupled with a commitment to excellence in all she does puts Jill in a league of her own. Over the decades she has built solid relationships with professionals throughout the housing industry across the country and around the globe, based on an integrity-based, hard-working approach to serving the needs of her agents and their clients.
The San Francisco market can be challenging for sellers and new home buyers as well as seasoned investors and it takes a proven leader to support the agents and their clients' needs through each transaction.
Jill is honored to be associated with the highest caliber of Realtors in San Francisco at Hill & Co.
▪ ePro
▪ Certified Real Estate Brokerage Manager CRB
▪ Certified Residential Specialist CRS
Christine Windbiel
Office Manager for our sales offices 

Chris is responsible for office operations at Hill & Co.'s headquarter office on Lombard Street as well as the original office on Union Street.

She joins Hill & Co. after a successful career in publishing, primarily with The Wall Street Journal. Chris was at the forefront of the Journal's international expansion. After working in NYC she was posted to Hong Kong, and she later opened the Journal's Singapore advertising office. Chris also managed the Southeast Asian region for five years. Chris was then recruited to London to develop business in Europe and parts of the Middle East. Upon moving to San Francisco, Chris managed the Journal's western region sales division for both online and print and grew it to the # 1 revenue producing region in the world.

Chris is thrilled to be a part of Hill & Co., where she's been known to say, "I like working with the best and Hill & Co. is definitely 'The City's Best'!"

In her spare time, Chris volunteers as a financial counselor working with clients needing to get their financial affairs in order. She also enjoys weekends at her home in Healdsburg swimming, gardening, wine and food tasting!

Khoi Vo
Director of Technology 

Khoi Vo is Hill & Co.'s Director of Information Technology. He has been in the industry since 1998 and he has a wide range of technology experience. Customer service related applications and infrastructure have been his most recent focus. Khoi believes in a systematic approach to understanding relevant technologies. He then deploys them to enhance user experiences and to achieve institutional goals.

Previously he held positions as a network engineer, systems administrator, technical writer, technical trainer and technical engineer. All of this experience enables Khoi to understand client needs at a very core level, and envision technology workflow accordingly.

Garey De Martini
Director of Marketing 

With more than 25 years of experience in all facets of marketing, promotion, branding and public relations, Garey oversees brand development for the company and its agents. He is also instrumental in helping to create state-of-the-art marketing programs to promote the sale of client homes.

His career includes stints as manager in the marketing departments of the San Francisco Chronicle and San Jose Mercury News. He also served as Creative Director at two leading ad agencies in Silicon Valley, and was most recently the Marketing Director of another San Francisco real estate brokerage.

A native of San Francisco, Garey is a graduate of U.C. Berkeley. He met his wife Maria in 2001, and they married in 2003.

Lynne Fox
Marketing Manager 

Lynne Fox is a recognized conceptual merchant with a successful career in merchandising a broad range of products and has a proven ability to source and develop merchandise with consistent success. She is a creative thinker and an imaginative problem solver. Lynne had been a selling agent for Hill & Co. in the past and rejoined the company in 2004 in her current capacity.

As a volunteer, Lynne has contributed significantly to the community at large. In 1977, she was instrumental in the development of the Decorator Showcase and was co-chairwoman of the first San Francisco University High School Event, which benefits the school’s scholarship fund. In 1991, after her diagnosis of breast cancer in 1990, Lynne launched and was chairwoman of the first annual “Susan G. Komen Race for the Cure” for breast cancer research. Lynne is still involved with the Komen Foundation and continues to work on raising awareness and funds to eradicate this disease by advancing research, education, screening and treatment.