About Keller Williams, Nancy Sillers Nancy Sillers, has joined Keller Williams Realty. Unlike other real estate companies, Keller Williams Realty was designed to reward agents for working together, to serve our clients better. Keller Williams Realty was founded on the principles of trust and honesty, emphasizing the importance of having the integrity to do the right thing and always putting our client™s needs first. Nancy has been a full time Real Estate Agent since 1991 with experience in Tarrant & Johnson Counties. Nancy has been a consistent multi-million dollar producer