I graduated from Haverford in 2005. It's a fairly prestigious small liberal arts college outside of Philadelphia (it was ranked 4th when I got in in 2001 but much of its endowment in 9/11 and is now ranked 8th by us news). It's a very liberal college with a quaker history though I believe it no longer has an official religious affiliation. The college is strong in the sciences which is the reason I went there. My faculty advisor, Gerry Gollub, for example, is recognized as a leader in the field of fluid dynamics. It takes pride in its campus and arboretum and I've heard many people with no affiliation with the college say it has the most beautiful campus in the US. Most students take about a quarter of their courses at Bryn Mawr college which is a similar but all girls college. Most events are shared between the colleges and there's considered to be little difference between a Haverford student and a Bryn Mawr student in terms of what they have permission to do. There is also a lesser relationship with Swarthmore college and the University of Pennsylvania. The college also is very proud of its honor code. Students, for example, may take tests home and are trusted not to open their text books while taking them. I would guess the college's pride in their honesty and trustworthiness was a major motivation in their decision to return the letter.