Harrison Mosack

Realtor · President · Friend

“Buying or selling a home will probably be the biggest financial decision you ever make. I promise to help make that experience as comfortable and rewarding as possible.”

Harrison brings positive energy and a vast set of skills and experiences to work on your behalf. Prior to entering the Atlanta real estate market, she worked in sales, marketing and negotiations. Then, in 2012, she joined Keller Williams North Atlanta as an investor agent, helping Blackstone Equity’s Invitation Homes acquire properties for their investment portfolio. Later, she joined their buyer team to pursue her passion for helping others find the ideal home for their family. In 2015, she switched to the KW Intown office to focus on selling real estate in five Intown Atlanta market.

In late 2016, Harrison decided it was time to start her own real estate business and truly make a name for herself. Her business is client-centric. She consistently exceeds customer expectations with expert guidance and unsurpassable service.

Harrison is a member of the Atlanta Board of REALTORS®, National Association of REALTORS®, the City Club of Buckhead and a graduate of the Realtor Institute and the Institute for Luxury Home Marketing. In 2016, Harrison received her certification as a luxury home marketing specialist, and has achieved recognition of being in the top 20% of Realtors under the age of 40.

She graduated from the University of Alabama-Tuscaloosa with a Bachelor of Business Administration in Marketing. She lives in Virginia Highland and is an active member of the community. Harrison is a strong believer in giving back and volunteers regularly with local non-profits, such as Covenant House, CURE, Habitat for Humanity and the Autism Society of Georgia.

Regina Toner


The Harrison Mosack team welcomes its newest member in the person of Regina Toner. Regina joins us from Keller Williams where she learned the real estate business – and first met Harrison.

Like many people, Regina had a unique, indirect path into real estate. For many years, she worked as a successful veterinary. But, after retiring due to an injury, she missed providing love and attention to “fur babies.” So, she came a real estate agent and now she brings that same professional care and concern to her clients.

An 18-year resident of Atlanta, Regina has a deep love and knowledge of the territory. She raised 4 kids in the local communities. Now, she enjoys the many restaurants and festivals the city has to offer and can often be found running, cycling or at the gym.

Tammie Olinde

Office Administrator/Transaction Coordinator
Nothing makes a home feel more homey than a smooth and easy contract experience. That’s why Harrison Mosack has hired a dedicated Transaction Coordinator. Meet Tammie Olinde.  As a professional contract manager, she’ll see that your home closes with little stress or anxiety.   Tammie Olinde, has had compliance and contract management experience since 2011. Previously, as the founder of Atlanta Contracts, she’d work hand-in-hand with the parties to ensure a smooth and easy closing. And now Tammie brings her closing skills to the Harrison Mosack team.   The moment your house goes under contract, Tammie will reach out to you to help organize your documents, keep up with contingencies, schedule appointments and prepare you for closing. She’ll be right by your side so you never feel lost or overwhelmed.   This is a service offered exclusively by our team. Welcome, Tammie.

Owning a home should be a wonderful experience. Starting here.