# Leonard Cooling

Leonard Frank Cooling (23 December 1903 – 15 February 1977) was an English physicist and engineer widely regarded as the "Founder of British Soil Mechanics". He played a pivotal role in the early development of soil mechanics in the United Kingdom, establishing the first British soil mechanics laboratory at the Building Research Station (BRS) in 1934.
Cooling published widely on soil mechanics and related subjects, and was one of the five founders of the soil mechanics and geotechnical journal, Géotechnique, along with Rudolph Glossop, Alec Skempton, Hugh Golder, and Bill Ward. He served on the publication's advisory panel from its first meeting in 1949 until 1969, and was chairman from 1966 to 1969.

## Life and career
### Education and early work

Cooling was born in Solihull on 23 December 1903. A promising student, he attended Yardley Secondary School before winning a scholarship to the University of Birmingham, where he graduated with a first-class honours degree in physics in 1925. In 1926, he obtained an MSc for research into the thermo-magnetic properties of nickel-iron and meteorites.
An accomplished athlete in his youth, Cooling played amateur football for England and West Bromwich Albion while also excelling in athletics as a Midland Counties Champion runner.

### Building Research Station and work in soil mechanics

In 1927, Cooling joined the Building Research Station as a Junior Scientific Officer, where his early work focused on capillarity, evaporation, and permeability of building materials. His work led to some involvement with soil physics at Rothamsted Experimental Station, and in 1933, under the directorship of Dr Reginald Stradling, Cooling was appointed head of the newly formed Soil Physics Section at BRS.
The small team, initially housed in a converted stable block, quickly established itself as a leader in British soil mechanics, equipped to conduct tests for Atterberg limits, consolidation, and soil shear strength. Cooling's work laid the foundation for soil mechanics research in Britain, notably investigating embankment slips and retaining wall movements. By 1935, the BRS group had been renamed the Soil Mechanics Section and were active in investigations such as embankment slips on sections of the Southern Railway and retaining wall failures in the London Clay.
In 1937, Alec Skempton commenced what would become a lifetime of work in soil mechanics under Cooling at the BRS, after abandoning his studies on reinforced concrete. Skempton and Cooling published research on London Clay and in August of the same year, the failure of the Chingford Dam resulted in the first UK visit by Karl Terzaghi, who redesigned the dam in co-operation with Skempton, Cooling, and the BRS soil mechanics team after Skempton had successfully identified the rapid rate of filling of the dam by the contractor, Mowlem, as the cause of the failure.

### International recognition

In 1936, Cooling was the sole UK delegate at the 1st International Conference on Soil Mechanics and Foundation Engineering in Harvard, presenting three papers. By the second conference in 1948, his efforts had catalysed a major expansion, with 74 British delegates and 57 papers presented. Cooling served as chair of the British Geotechnical Society (BGS) from 1955 to 1959, edited Géotechnique, and delivered the second Rankine Lecture in 1962. He was a prominent figure in the Soil Mechanics and Foundations Committee of the Institution of Civil Engineers, as well as the British National Committee of the International Society for Soil Mechanics and Foundation Engineering (ISSMFE), formed in 1947. He served on the committee that would later evolve into the British Geotechnical Society for many years and held the role of Chairman of the Society from 1955 to 1959. In 1957, despite his training as a physicist, he was elected an Associate of the Institution of Civil Engineers in recognition of his exceptional contributions to civil engineering.

### Key investigations and contributions

Cooling's investigations and notable work included:
* Chingford Dam failure (1937), which coincided with Karl Terzaghi's visit to Britain.
* Development of the first field and laboratory methods for soil sampling and testing in Britain.
* Groundbreaking studies on soil consolidation and the influence of pore water pressure.
* He was instrumental in early embankment and foundation studies in London Clay and Essex sea defence failures after the North Sea flood of 1953.

### Legacy and personal life

Cooling lived in Oxhey with his wife and daughter, and retired in 1968. He remained active in geotechnics until his death on 15 February 1977 at the Peace Memorial Hospital in Watford. The British Geotechnical Society established the Cooling Prize in 1970 to honour his commitment to young professionals, awarded annually for the best paper by a young engineer.