This man assumed the identity of a dead child Edmund Alexander Champion de Crespigny (1890-1905). He used this name and the biographical details when he married on 30 Dec 1919 at Lausanne, Vaud, Switzerland to Elisa Emma (Lilette) Richard (1890–1976). 
This man continued to assume the identity though his first name evolved to Claude and his wife, Elise, was known as Lilette. I was only able to reconcile the records when reviewing his 1960 naturalization papers. What follows is the chronology of his life as told in records that have been digitised and can be found through genealogy websites, in particular through ancestry.com.
In August 1920 Claude de Crespigny, engineer and director, arrived in Boston, Massachusetts, on the SS Canopic via Canada. He stated that he was born in London and his wife was Lillette. She had a Swiss address.
On 9 August 1922 Claude and Lilette had a child, Michelle Rosamonde Champion de Crespigny, born in Switzerland. She came to America in 1928. According to Michelle’s 1941 application for naturalization the family settled in Chicago.
In 1923 Claude Edward Alexander de Crespigny, mechanical engineer, living at Scranton Pennsylvania, declared his intention to apply for naturalization.
On 25 November 1927 Claude Edmund Alexander Champion de Crespigny applied for naturalization in Chicago. He stated he was born 12 July 1890 at White Lodge Lyndhurst. He was currently a typewriter salesman, living in Chicago. He had arrived on the SS Canopic in 1920. He had been living in Illinois since 1924. His wife was Lillette and they had married in Switzerland. She was currently living in Toronto. They had a daughter who was currently living in Switzerland. The application was denied by the court in December 1928 due to “want of prosecution; unable to obtain depositions”. It would seem Claude failed to follow through on his application.
At the time of the 1930 US census Claude, Lillette and Michelle were living at 1546 Farwell Avenue, Chicago. Claude was a typewriter salesman.
In December 1930 the Blue Island Suburban Star of Blue Island, Illinois, a suburb of Chicago, reported that Professor Claude Campion de Crespigny (sic), a local resident, would talk on “Britain in India today”. Professor de Crespigny was a member of the faculty of Loyola University and had served with the British Legation in India. (As this was before 1947 when India gained independence, the term British Legation in India makes no sense.) I have found no evidence of a Professor de Crespigny at Loyola University and given that Claude was living in Chicago, Illinois, I believe this lecturer is Edmund Claude. There are a number of universities with that name including Loyola University, Chicago.
On 26 September 1935 Claude R Crespigny married Ruby V. King in Manhattan, New York.
When Claude’s wife Lilette applied for naturalization in 1944 she stated she and Claude had divorced in 1940.
In 1940 Claude and Lilette’s daughter Michelle was at school at Morgan Park High School, Chicago. I have not been able to locate any member of the family on the United States 1940 census.
In 1942 Claude was living at 14 East 54 Street New York when he registered for the draft as Claude Crespigny. He was 52 years old and stated he was born 12 July 1890 at Lyndhurst, England. A person who would always know his address was Fred W Peterson of same address. His employer was Fashion Center, Dechard, Tennessee and business was Travel for Dechard, Tennessee. On the reverse of the card it stated that Claude had a gunshot wound on his forehead and a bayonet wound on his right hand. He was 5’9″ tall with hazel eyes and brown hair.
In 1960 Claude again petitioned for naturalization. He was living at 414 Fannin, Houston Texas and was a hotel clerk. He had one daughter, Michelle, wife Ruby who had been born St Vincent British West Indies and that he had married in 1945 in New London, Connecticut, but since divorced. He stated his name had changed to Claude Edmund Crespigny but his full true and correct natural name was Edmund Alexander Champian de Crespigny (sic). He stated that he had arrived in America under the name Claude Emil de Crespigny.
Claude died 31 January 1967. The informant was Mrs Ella Roland. She stated his date of birth was 12 July 1890 and that he had been born in England. She did not know the names of his parents. She stated he was a US citizen, his occupation was hotel clerk of Houston Texas. His usual address was 811 Sul Ross appartment number 3 in Houston Texas. He had been living in Houston for 20 years. He died at Ben Taub General Hospital of hypotension due to upper gastrointestinal bleeding. There was an autospsy. His body was donated to medical research.
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