What is frederick parker?

As an AI language model, I'm not sure which Frederick Parker you are referring to, as there are many individuals with this name. However, I can provide information on some notable figures with the name Frederick Parker:

1. Frederick Parker, a British furniture maker who founded the company now known as Parker Knoll, which produces high-quality furniture.

2. Frederick Douglass Parker Sr., an African American inventor who patented improvements to traffic signal systems, gas engines, and hydraulic elevators in the early 20th century.

3. Frederick Parker-Rhodes, an Australian actor known for his roles in the TV series "The Bill" and the films "Life in a Day" and "The Flying Scotsman".

4. Frederick C. Parker, a United States Army officer who served in both World War I and World War II.

5. Frederick Parker Gates, an American historian and educator who wrote several books on medieval history and served as a professor at Harvard University.