After earning a bachelor’s degree in forestry from Auburn University, Walley joined Scott Paper Company in Mobile, Alabama, contributing to its timberland management and strategic operations. In 1994, he joined Forest Investment Associates (FIA), advancing the company's expansion and eventually assuming the role of President and CEO. Under his guidance, FIA emerged as a global leader in forestland investment advising, managing over two million acres of timberland investments.

Walley has also held several leadership roles in service to the forestry industry. He is a longtime member of the College of Forestry, Wildlife and Environment’s Advisory Council and previously served as chair of its campaign leadership team. In 2017, Walley was nominated and received the college’s Outstanding Alumni Award.

Most recently, Walley was appointed Auburn's Earl H. and Sandra H. Weaver Professor. In this role, Walley will advance the college’s forestry teaching, research, and scholarship.