Exhibit 16.1
March 29, 2016
Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549
Ladies and Gentlemen:
We have read Item 4.01 of Form 8-K dated March 29, 2016, of Koppers Holdings Inc. and are in agreement with the statements contained in paragraphs 2, 3 and 4 of Item 4.01(a). We have no basis to agree or disagree with other statements of the registrant contained therein.
/s/ Ernst & Young LLP