The College of Idaho is a private, residential liberal arts college in the western United States located in Caldwell, Idaho.
 Founded in 1891, it is the state's oldest private liberal arts college, with an enrollment of 1,140 students.
Whitman College is a private liberal arts college located in Walla Walla, Washington.
 Initially founded as a seminary by a territorial legislative charter in 1859, the school became a four-year degree-granting institution in 1882.
 Whitman College is accredited by the Northwest Association of Schools and Colleges and competes athletically in the NCAA Division III Northwest Conference.
 The school offers 48 majors and 33 minors in the liberal arts and sciences, and has a student to faculty ratio of 9:1.
 Whitman was the first college in the Pacific Northwest to install a Phi Beta Kappa chapter, and the first school in the United States to require comprehensive exams for graduation.
 Whitman was ranked tied for 41st in the nation in the 2017 "U.S. News & World Report" list of Best Liberal Arts Colleges.
 Whitman's acceptance rate for 2015 was 41%.
The Colorado College (CC) is a private liberal arts college in Colorado Springs, Colorado, United States, near the foot of the Rocky Mountains.
 It was founded in 1874 by Thomas Nelson Haskell in his daughter's memory.
 The college enrolls approximately 2,000 undergraduates at its 90 acre campus, 70 mi south of Denver.
 The college offers 42 majors and 33 minors, and has a student-faculty ratio of 10:1.
 Famous alumni include James Heckman, Ken Salazar, Lynne Cheney, Thomas Hornsby Ferril, Marc Webb, and Steve Sabol.
 Colorado College had an acceptance rate of 15% for the Class of 2021, was ranked as the best private college in Colorado by Forbes, and was listed as tied for the 23rd-best National Liberal Arts College, and as the No. 1 Most Innovative Liberal Arts School, in the 2018 "U.S. News & World Report" rankings.
A liberal arts college is a college with an emphasis on undergraduate study in the liberal arts and sciences.
 A liberal arts college aims to impart a broad general knowledge and develop general intellectual capacities, in contrast to a professional, vocational, or technical curriculum.
 Students in a liberal arts college generally major in a particular discipline while receiving exposure to a wide range of academic subjects, including sciences as well as the traditional humanities subjects taught as liberal arts.
 Although it draws on European antecedents, the liberal arts college is strongly associated with American higher education, and most liberal arts colleges around the world draw explicitly on the American model.
Macalester College ( ) is a private, coeducational liberal arts college located in Saint Paul, Minnesota, US.
 It was founded in 1874 as a Presbyterian-affiliated but nonsectarian college.
 Its first class entered September 15, 1885.
 Macalester is exclusively an undergraduate four-year institution and enrolled 1,978 students in the fall of 2013 from 50 U.S. states and 90 countries.
 In 2015, "U.S. News & World Report" ranked Macalester as tied for the 23rd best liberal arts college in the United States, 6th for undergraduate teaching at a national liberal arts college, and 19th for best value at a national liberal arts college.
Westminster College is a private liberal arts college located in the Sugar House neighborhood of Salt Lake City, Utah, United States.
 The college comprises four schools: the School of Arts and Sciences, the Bill and Vieve Gore School of Business, the School of Education, and the School of Nursing and Health Sciences.
 It is the only accredited liberal arts college in the state of Utah.
Ancilla College, near Donaldson, Indiana, is a two-year private liberal arts college that admits both men and women students.
 Ancilla College was founded by the Poor Handmaids of Jesus Christ in 1937 as an extension of DePaul University for the training of novices and candidates of the Poor Handmaids of Jesus Christ.
 In 1966 the college started admitting the public as a private liberal arts community college.
 Ancilla College focuses on serving the seven surrounding counties of Indiana.
 Ancilla College grants associate degrees in multiple programs, from which Ancilla graduates may easily transfer to a four-year college or university, especially via the transfer agreements that Ancilla College has with 14 Indiana colleges and universities.
 The Latin word "ancilla" means "slave girl," a reference to the college's sponsor, The Poor Handmaids of Jesus Christ.
Kerry S. Walters (born 1954) is Professor emeritus of Philosophy at Gettysburg College and author of numerous books on philosophy, religion, and American history as well as over 200 articles in academic journals, trade magazines, and newspapers.
 His special fields of interests include Christian mysticism, atheism, the ethics of diet, Christian pacifism, critical thinking, deism in early America, and the history of the early republic.
Oberlin College is a private liberal arts college in Oberlin, Ohio.
 The college was founded as the Oberlin Collegiate Institute in 1833 by John Jay Shipherd and Philo Stewart.
 It is the oldest coeducational liberal arts college in the United States and the second oldest continuously operating coeducational institute of higher learning in the world.
 The Oberlin Conservatory of Music, part of the college, is the oldest continuously operating conservatory in the United States.
Gettysburg College is a private, four-year liberal arts college founded in 1832, in Gettysburg, Pennsylvania, United States, adjacent to the famous battlefield.
 The 225 acre campus is located at 300 North Washington Street in the Northwest corner of the town.

Question: Kerry S. Walters is a professor at the private liberal arts college in Gettysburg, Pennsylvania in what field?
Answer: Philosophy