Kendall is first mentioned in the episode The Job. When interviewing Jim, David Wallace mentions his dislike for the HR representative Kendall, paralleling Michael's dislike for Scranton HR representative Toby.

When Michael asks Holly if her date called her back, Holly becomes confused at first and asks Michael if he means Kendall however Michael tells her he means her date (Weight Loss).

In Business Ethics, Kendall upbraids Holly on the phone for not completing her branch's ethics training. He is uninterested in pursuing Meredith's ethics violation because it benefited the company.

Given Kendall's authority over Holly, it is reasonable to assume that he is not merely the HR representative for the Corporate office but a more senior HR representative, possibly the department head.

In Company Picnic, Toby talks about the HR convention with a person from Corporate, presumably Kendall. Kendall proves to be boring and dull just like Toby.