According to Official Guinness Records,
The most switch grip pull ups in one minute (male) is 26 and was achieved by Ron Cooper (USA) on behalf of Reebok, in Brooklyn, New York, USA, on 1 February 2017.Attempted at the Reebok Nano 7 Launch Event.
For a complete list of 2017 records, please visit 2017 Guinness Records in United States.