Thomas Arnold Crosier was born in Sherburn Malton, York England on September 23, 1927. He was educated at Nunthorpe Grammar School in York, His engineering training began, as a junior draftsman, with the LNER Railway which became British Rail in 1943. After York, he worked in Edinburgh and London.
With the completion of a Bachelor of Science in Engineering degree at London University, he worked for several years with Mott, Hay and Anderson Consulting Engineers working as a designer and resident engineer.
In 1952, Arnold Crosier moved to a position with the Canadian National Railway in the Winnipeg buildings construction department. By 1954, he was established as an independent consulting structural engineer, operating as TA Crosier and Associates
In the next several years the company evolved and in 1976 Crosier joined David Kilgour in founding Crosier Kilgour and Partners.
Mr. Crosier died on June 16, 2005.