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Meet The Team

Owner/Associate Broker

Owner/Associate Broker Andrew Monaghan, Native of Ireland came to the United States in 1989, with a background in the upper end of the Hotel industry. In 2001, he chose to bring the skills and knowledge that he learned to the Real estate profession. Through the belief in constant learning and growth, he joined a team of a successful agent where he learned the real estate industry in the west valley. He joined Keller Williams Professional partners in 2005. Along with His Wife, Mandi, He currently leads a large, top producing, successful real estate team in the west valley, He is a Business Coach with KW MAPS. He has consistently been ranked in the Top 1% of real estate agents in ARMLS, primarily in the Valley, and has also been named in the Wall Street Journal Top Agents nationwide. He is a member of the exclusive Gary Keller Mastermind group. A strong believer in Growth, Education, and Constant Improvement in both Real Estate and leadership. He resides in Glendale, Arizona and is passionate about serving his clients and fellow agents by assisting them in reaching their real estate goals. He enjoys Hiking, Traveling, Golf, Giving Back and most importantly, time with his Wife and children!

Owner/MAPS Coach


Mandi began her real estate career in 2005 with Keller Williams, after serving local municipalities Economic Development and Growth Department. She has always had a passion for business building and growth, having grown up as a child watching her father lead a major development company. Her first job was at 11 years old helping out at the office while learning from great leaders. She quickly grew her real estate business through connecting with the community and finding ways to deliver value at a high level. After selling real estate and building a business, she became a MAPS coach, and is now empowering others to lead their lives and business to the next level through coaching.


Mandi’s passion and heart is in giving and children. In 2012, she founded and formed a non-profit Foundation in her local area that inspires and empowers children to give and serve in the community, while having the opportunity to grow and develop in their leadership. She loves sharing with others how to do the same in their community and truly believes that this life is about living from contribution and making a big impact for others!

Buyer Specialist

Originally from Connecticut, Matt moved to Arizona in the summer of 2001 while working for a major Relocation Company. It was during that time that he earned the designation of Certified Relocation Professional (CRP). Prior to leaving Connecticut, he gained invaluable customer service experience in his 13 year stint at a catering facility in Oxford (a small town in New Haven County) where he held many front end positions including General Manager.
Matt Tarby specializes in helping his clients find the homes they are looking for at a fair market price, without headaches or heartaches.

Buyer Specialist


The Monaghan Group warmly welcomes Tony Masella to the family. He has been a licensed real estate agent since 2012.

Tony is originally from Niagara Falls, New York where he spent 24 years in various healthcare capacities, 14 of which were spent in healthcare IT (Information Technology). In 1997, Tony moved to sunny Phoenix in search of better weather and career opportunities. Tony spent 11 years as an owner of an auto collision and auto sales facility in Glendale. Serving client needs, by helping them to realize their dreams, is still what Tony loves the most. When Tony is not busy with clients, you can find him tinkering with his 1972 Z/28 Camaro.

Team Manager


As a longtime resident, as a mother and a real estate agent, Amy is intimately familiar with our city and with the neighborhoods of our northern Valley.  Whichever of our greater Phoenix Valley cities, towns or neighborhoods appeals to you, start your search here to find that special home just waiting for you.
Whether you are selling or buying,  a first timer or veteran, having a professional, experienced Realtor Team working for you will make all the difference.  Our key to ensuring your satisfaction is to listen carefully to your preferences and needs and work to achieve exactly that.  Buying or selling a primary residence, vacation home or investment property, we will work together to make that an exciting and pleasant experience.