Garrett Grier was born and raised in Milford, Delaware. Garrett graduated from Elon University in 2003 with a Bachelor of Science in Business Administration. He moved back to Delaware in 2004 to begin his career as an entrepreneur. In 2004, Garrett and a business partner expanded Progressive Lawn Care and later sold the company in 2009. In 2006, he opened Duck In Car Wash in Milford, Delaware; a full service car wash operation. He later expanded the car wash business by opening a second location in 2014 in Seaford, Delaware. On October 12, 2018, Garrett sold both Duck In Car Wash locations to Wet Dog Car Wash based out of Easton, Maryland. Garrett is currently in the process of researching his next business venture.

Garrett is also a former six-year member of the Milford City Council and still enjoys community involvement. He currently sits on the foundation board for Bayhealth and Avenue Preschool in Milford. Garrett currently lives in Milford and loves spending time with his wife, Becca, and children, Teagan and Layton.