Sir Frank Williams, co-founder of the team which bears his name, is in a stable condition in hospital, his family have said in a statement.
Williams first entered Formula 1 with his own team in 1969 and the current constructor was founded in 1977, since when it has competed in the world championship.
Williams has won seven Drivers’ titles and nine Constructors’ Championships, its most recent coming in 1997.
The team has suffered a downward spiral in recent years and also struggled financially, slipping to last spot in 2018, where it has since remained.
Sir Frank scaled back his day-to-day involvement in the team in the early 2010s, with daughter Claire spearheading operations at grands prix, holding the role of deputy team boss.
However the family sold the organisation to investment firm Dorilton Capital in August and relinquished involvement following the conclusion of September’s Italian Grand Prix.
Sir Frank’s most recent paddock appearance came at the 2019 British Grand Prix, at which he was taken on a hot lap in a Mercedes road car by World Champion Lewis Hamilton.
On Tuesday it was announced that the 78-year-old has been hospitalised.
“Sir Frank Williams has recently been admitted to hospital where he is currently in a stable condition,” read a statement issued on behalf of the Williams family.
“Frank’s medical condition is a private matter and therefore the family will not be releasing any further details at this time.
“We ask for you to respect the family’s privacy. The team will release a further update in due course.”