Rudbeckia species, probably Rudbeckia hirta, Black-eyed Susan. I chose this image to post because the stone in the background gives the overall picture a winter look that contrasts sharply with the yellow. Taken with Nikkor 70-300mm AF-S VR ED.
Below is another Rudbeckia perspective. This second image was taken several weeks ago at the Flight 93 National Memorial. Also taken with Nikkor 70-300mm AF-S VR ED.