The ability to conceive design solutions for complex environmental engineering challenges has been the hallmark of Greeley and Hansen's history. Greeley and Hansen's engineers solve problems by combining creativity with precision engineering.
Greeley and Hansen's search for challenging assignments began over 90 years ago, in 1914, a time when the Wright Brothers first made a name for themselves with a newly patented airplane design. In those days, sewage was referred to as "wishwater" in polite company.
The driving force of the founding of Greeley and Hansen was Samuel A. Greeley. Born on Chicago's north shore in 1882, Greeley was educated at Harvard and MIT. His first professional position was with an engineering firm headed by Rudolph Hering. Greeley soon became Hering's principal assistant, and together they focused their attention on refuse disposal projects. As their expertise built, it provided the foundation for the industry's first comprehensive study on solid waste collection and disposal. Published in 1921, the co-authored classic The Collection and Disposal of Municipal Refuse served as a standard textbook for decades.
In 1912, Greeley accepted a new job from the Sanitary District of Chicago. As assistant to Langdon Pearse, already a well-respected engineer, Greeley developed first-hand experience with one of the county's foremost experts in sewer system design.
Recognizing the great nationwide need for their talents, in 1914 the two founded their own practice--Pearse and Greeley. The Sanitary District of Chicago continued to trust in those two men and became the firm's first client.
By 1920, Paul Hansen, another MIT graduate, joined the firm as a full partner. His previous accomplishments included services as chief sanitary engineer for the Illinois State Department of Public Health. The partnership was renamed Pearse, Greeley and Hansen, providing a full range of environmental engineering services for water supply and purification, and sewage and refuse disposal.
When Pearse left the partnership in 1932 to concentrate full-time on his continuous responsibilities with the Chicago Sanitary District, the firm became Greeley and Hansen. Later, after the deaths of Hansen in 1944 and Greeley in 1968, the remaining partners chose to retain the firm's name-a posthumous tribute to the gentlemen's expertise and leadership in providing a solid foundation upon which the firm continues to grow.
A firm with more than nine decades of continuous service has milestones along the way that enhance the course of their journey. These milestones are highlighted below: