Diane Ramirez is the chief strategy officer for the New York office of Berkshire Hathaway HomeServices New York Properties.

Ramirez is also the co-founder and former CEO of Halstead Property. Ramirez co-founded the firm in 1984 with Clark Halstead, who is no longer a partner following the acquisition of Halstead Property by Tera Holdings in 2001.

Ramirez was president of Halstead for 14 years before becoming CEO in 2013. She serves on both the Department of State Real Estate Board and the Real Estate Board of New York (REBNY). Prior to Halstead Property, Ramirez was a real estate agent with Key Ventures in New York and Gardens Insurance in Palm Beach, Florida. She has not brokered a real estate sale since 1987, when she sold a townhouse to Calvin Kline on East 76th Street.

In 2020 Terra Holdings announced that Halstead Property would be merged into sister company Brown Harris Stevens, where Ramierez became Executive Chairman & Senior Advisor. In 2021, she left BHS to join Berkshire Hathaway HomeServices.

She is married to Samuel Ramirez, founder and CEO of the investment banking firm Samuel A. Ramirez & Company. Ramirez is active in charities which include The Valerie Fund and the Neighborhood Coalition for Shelter.