A former teacher who began her real estate career in Colorado, she has completed more than eighteen years in the profession. She holds real estate licenses in Virginia and Florida. She specialized in the marketing of upper income custom homes and is a lifetime member of the Montgomery County (Maryland) Association of Realtors Million Dollar Club. She holds her broker/salesperson's license in Florida.

She served on the Government Affairs Committee and the International Affairs Committee for the Northern Virginia Association of Realtors and the Membership Committee for the Montgomery County Association of Realtors. she was a judge for the National Association of Realtors "Who is Today's Realtor" contest in 1995 and was a Certified International Property Specialist. Diana is a Registered International Member with the Iinternational Real Estate Institute, which holds consultative status with the United Nations. Other course work includes several international trade seminar courses from the World Trade Institute in Baltimore, Maryland, including "Export Marketing and Promotion."

A past president of the Capital City Optimist Club of Washington, DC, an international service club, she has also been active in several diplomatic organizations for many years, including THIS (The Hospitality and Information Service) which is an adjunct of the Meridian House, and Welcome to Washington.

She was a developer/builder of custom homes in Maryland and holds memberships in NAWIC, the national association of women in construction and NAHB, the National Association of Home Builders. Her pending trademarks are: FLEXHOME™ and FLEXYSTEMS™. She holds a patent with thirteen claims entitled: BUILDING CONSTRUCTION WITH TENSIONED SUPPORT SYSTEM. Number: 5,930,971