Deloitte Touche Tohmatsu (also branded as Deloitte.) is one of the largest professional services organizations in the world and one of the Big Four auditors, along with PricewaterhouseCoopers, Ernst & Young, and KPMG.

According to the organization's website , Deloitte has approximately 165,000 professionals at work in 140 countries, delivering audit, tax, consulting and financial advisory services through its member firms.

Its global headquarters are located in New York City, New York. European headquarters are located in London.

Early history

In 1845 William Welch Deloitte opened an office in Basinghall Street in London: he was the first person to be appointed an independent auditor of a public company.Deloitte history He went on to open an office in New York in 1880.

In 1895 Charles Waldo Haskins and Eijah Watt Sells formed Haskins & Sells in New York.

In 1898 George Touche established an office in London and then in 1900 joined John Ballantine Niven in establishing the firm of Touche Niven in the Johnston Building at 30 Broad Street in New York. At the time, there were fewer than 500 CPAs practicing in the United States, but the new era of income taxes was soon to generate enormous demand for accounting professionals.

On April 1, 1933, Colonel Arthur Hazelton Carter, President of the New York State Society of Certified Public Accountants and Managing Partner of Haskins & Sells, testified before the U.S. Senate Committee on Banking and Currency. Carter helped convince Congress that independent audits should be mandatory for public companies.

In 1947, Detroit accountant George Bailey, then president of the American Institute of Certified Public Accountants, launched his own organization. The new entity enjoyed such a positive start that in less than a year, the partners merged with Touche Niven and A.R. Smart to form Touche, Niven, Bailey & Smart. Headed by Bailey, the organization grew rapidly, in part by creating a dedicated management consulting function. It also forged closer links with organizations established by the co-founder of Touche Niven, George Touche: the Canadian organization Ross and the British organization George A. Touche. In 1960, the firm was renamed Touche, Ross, Bailey & Smart, becoming Touche Ross in 1969.

Mergers

In 1952 Deloitte merged with Haskins & Sells to form Deloitte, Haskins & Sells. In 1968 Nobuzo Tohmatsu formed Tohmatsu Awoki & Co, a firm based in Japan that was to become part of the Touche Ross network in 1975. In 1972 Robert Trueblood, Chairman of Touche Ross, led the committee responsible for recommending the establishment of the Financial Accounting Standards Board. He led the expansion of Touche Ross in that era.