Skinner was born on 19 January 1900 in Melbourne, Australia, before subsequently emigrating to New Zealand. His father was a missionary in Te Kopuru, near Hokianga. Skinner settled in the Waitaki District and married Julia Buckley Gray of Palmerston North in 1924. They were to have two sons together, who later went into business in Westport together. Skinner established himself politically as a union leader in Westport whilst working as a carpenter by trade. He then turned his profession to farming up until the depression in the early 1930s. He distinguished himself after being elected the president of the Inangahua Medical Association. He was instrumental in setting up a co-operative medical insurance scheme for labourers working building the Waitaki hydroelectric station alongside Andy Davidson, Arnold Nordmeyer and Gervan & Ethel McMillan. All subsequently becoming prominent members of the Labour party.
Skinner was a Member of Parliament from 1938 to 1962; he was MP for Motueka between 1938 and 1946, then MP for Buller from 1946 to 1962. Early on in his career as an MP, Skinner was somewhat sympathetic to the plight of John A. Lee, but did not to support him openly. Skinner made good impressions as an MP and gained a reputation for possessing "down-to-earth Kiwi common sense".
First Labour Government
Between 1943 and 1949 he held several ministries; Lands, Rehabilitation, Valuation and State Forests. As Minister of Rehabilitation he distinguished himself in the area of soldier resettlement, enabling returned servicemen to return to live and work in New Zealand following World War II. As a minister Skinner gained a reputation of sincerity, which helped his otherwise lackings as an orator. Skinner was seen by many as Labour's rising star. In recognition of this, he was subsequently elected deputy-leader of the Labour Party in 1951 while it was in opposition. However, there had been speculation that he had sought the leadership, but this was dismissed as merely media gossip. In the attempted coup against Walter Nash's leadership in 1954, Skinner sided with Nash and his status as the deputy-leader was reaffirmed when he remained unopposed in the position. In 1956 he suffered a heart attack, but made a good recovery in the following months.
Following Labour's victory in the 1957 election, Skinner became Deputy Prime Minister in Walter Nash's ministry. He also held the Lands and Agriculture portfolios. In government, Skinner still did not make further impressions in public opinion, where he was still seen by the public as merely in Nash's shadow. As Minister of Agriculture Skinner fought against unfair trading practices in the United Kingdom regarding New Zealand's dairy imports. New Zealand faced a recurring problem. Dairy prices had fallen drastically, largely because a number of countries were 'dumping' subsidized butter. Skinner lead a delegation of officials which persuaded the British government to reduced tariff preferences for New Zealand goods in return for exempting British goods from quantitative restrictions. He likewise passed an act of parliament to safeguard New Zealand's livestock against Hydatid disease. As a result of his work in the area, it is said that Skinner was an instrumental figure in the establishment of New Zealand's pulp and paper industry. A notable feature of the Second Labour Government was Nash's frequent absences from the country. This left Skinner to be acting Prime Minister both frequently, and for lengthy periods. He was effectively in charge of the governments domestic affairs whilst Nash busied himself with international matters. His first wife died in 1957 and in 1958 he married Lois McHaffey. Skinner was the acting Prime Minister at the time of his wedding.
Opposition
Following the Labour defeat at the 1960 election, Skinner again became Deputy Leader of the Opposition. Walter Nash favoured Skinner as his successor and was planning to announce his retirement as leader at Labour's 1962 party conference to clear the way for Skinner. The media and public were widely anticipating Skinner to lead Labour at the 1963 election. After Skinner's sudden death Nash then favoured Fred Hackett to replace him after he had been elected Skinner's successor as deputy leader. However, Hackett then too died leaving Nash to be replaced by Arnold Nordmeyer when he eventually resigned in 1963.
Death
Skinner attended the Anzac Day ceremony at the Wellington Cenotaph as opposition representative before returning to his home in Takaka later in the day. He died in his sleep early the next morning, aged 62. He was survived by his second wife and two sons.