Israel Moses Sieff, Baron Sieff (4 May 1889 – 14 February 1972) was a British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 businessman.

He was educated at Manchester Grammar School

Manchester Grammar School

The Manchester Grammar School is the largest independent day school for boys in the UK . It is based in Manchester, England...

 and Manchester University. One of the theatres at the Manchester Grammar School is named in his honour.

Sieff was chairman of the British retailer, Marks & Spencer

Marks & Spencer

Marks and Spencer plc is a British retailer headquartered in the City of Westminster, London, with over 700 stores in the United Kingdom and over 300 stores spread across more than 40 countries. It specialises in the selling of clothing and luxury food products...

 from 1964 to 1967. In 1966 he had been created a life peer

Life peer

In the United Kingdom, life peers are appointed members of the Peerage whose titles cannot be inherited. Nowadays life peerages, always of baronial rank, are created under the Life Peerages Act 1958 and entitle the holders to seats in the House of Lords, presuming they meet qualifications such as...

 as Baron Sieff, of Brimpton in the Royal County of Berkshire

Berkshire

Berkshire is a historic county in the South of England. It is also often referred to as the Royal County of Berkshire because of the presence of the royal residence of Windsor Castle in the county; this usage, which dates to the 19th century at least, was recognised by the Queen in 1957, and...

.

He was president of the Political and Economic Planning

Political and Economic Planning

Political and Economic Planning was a British policy think tank, formed in 1931 in response to Max Nicholson's article A National Plan for Britain published in February of that year in Gerald Barry's magazine The Week-End Review....

 think-tank from its foundation in 1931, and chairman until 1939.

Upon the death of his son Daniel Sieff --- and with the financial support of his business partners and relatives by marriage, the Marks and Sacher families --- Israel Sieff endowed the 1934 creation, by Chaim Weizmann

Chaim Weizmann

Chaim Azriel Weizmann, , was a Zionist leader, President of the Zionist Organization, and the first President of the State of Israel. He was elected on 1 February 1949, and served until his death in 1952....

, of the Daniel Sieff Research Institute in Rehovot

Rehovot

Rehovot is a city in the Center District of Israel, about south of Tel Aviv. According to the Israel Central Bureau of Statistics , at the end of 2009 the city had a total population of 112,700. Rehovot's official website estimates the population at 114,000.Rehovot was built on the site of Doron,...

, present-day Israel

Israel

The State of Israel is a parliamentary republic located in the Middle East, along the eastern shore of the Mediterranean Sea...

. Renamed the Weizmann Institute of Science

Weizmann Institute of Science

The Weizmann Institute of Science , known as Machon Weizmann, is a university and research institute in Rehovot, Israel. It differs from other Israeli universities in that it offers only graduate and post-graduate studies in the sciences....

 in 1949 with the Sieff family's consent, it is presently Israel's premier research university in the natural sciences.

His second son was Marcus Sieff, Baron Sieff of Brimpton