________ is the CEO of Twitter who has pledged $1 billion of his wealth for fight against coronavirus ?

Twitter Inc. Chief Executive Officer Jack Dorsey on 7th April pledged $1 billion of his stake in Square Inc., the payments processor that he co-founded and heads, to help fund relief efforts related to the coronavirus pandemic. Dorsey, whose net worth is estimated at $3.3 billion by Forbes, also said that he was pledging his stake in Square instead of Twitter because he owns a bigger portion of the payments processor. He also said that he would pace the sale of the pledged shares over time.