Herbert Arthur Sinnott

Herbert Arthur Sinnott
Sinnott pictured in The Calgary Daily Herald, June 15, 1918
18th Mayor of Calgary
In office January 2, 1913 – January 2, 1915
Preceded by	John William Mitchell
Succeeded by	Michael Copps Costello
Personal details
Born	(1871-01-07)January 7, 1871 Kings County, New Brunswick, Canada
Spouse(s)	Margaret Horne (1901–1906; her death)
Children	Margaret B. Sinnott (1906–1988)
Alma mater	Mount Allison University (B.A., 1895)
Occupation	educator, barrister, politician

Herbert Arthur Sinnott (January 7, 1871 – after 1923) was a Canadian educator, lawyer and municipal politician who served as the 18th mayor of Calgary, Alberta from 1913 to 1915.

Sinnott was born in Kings County, New Brunswick on January 7, 1871 to David S., a farmer, and Frances (née Taylor) Sinnott. After attending schools in Sussex, New Brunswick, Sinnott graduated from Mount Allison University with a Bachelor of Arts and started his teaching career in Gagetown as principal of a grammar school. He later taught high school in Moncton, New Brunswick before moving west to Alberta in 1900. In 1903, he became a high school principal in Calgary, the first ever to the city. He began a career in law in 1908, articling under Thomas M. Tweedie. In 1911, he was called to the bar. Around this time, Sinnott also owned and rented out various properties in the city of Calgary as well as Lethbridge. He also served on the Calgary School Board as trustee in 1912 and 1920–22 along with chairman from 1908–11 and 1918–19.

Sinnott was elected as Mayor of Calgary and served in this position from January 2, 1913 to January 2, 1915. During his time in office, oil was discovered within the city of Calgary, and it was said that the "[whole city] quickly became oil conscious".

In January 1923, Sinnott pleaded guilty in a court to "misappropriating clients' trust funds" during his work as a lawyer in Calgary. During his trial, Sinnott admitted his guilt and was sentenced to seven years to be served in a Prince Albert, Saskatchewan jail. The magistrate had expressed that "the more grievous" crime that of the betrayal of trust of Sinnott to his clients, and that it was unfortunate that such a citizen of high of esteem, had admitted to committing the crimes. The magistrate also expressed that the punishment was decided to set a precedent and to "deter others from doing the same thing", along with restating that though it was hard to see "a citizen of Mr. Sinnott's calibre" take the sentence, it was a necessary justice. It is not known where Sinnott went after presumably leaving prison, although there have been rumours that he may have moved to Australia shortly thereafter.