The president calls and presides over any cabinet meetings. My understanding is that President Obama has called only one or maybe two cabinet meeting since his term began in 2008. The president is , of course , the boss over the cabinet if that is what you are asking.
Cabinet meetings are usually lead by the President or the Prime Minister. The Cabinet is responsible to ensure that the executive functions are fully implemented.
It would depend on the type of government of the country.
The President
prime minister
Attorney General
finance minister
prime minister
The Speaker of the House
speaker
finance minister
the speaker.
A chairperson is whoever presides over a meeting. They would be the one who calls the meeting to order, asks about the old and new business concerning the group, and leads the meeting.
Its the judge who presides over a magistrate court
The speaker presides over the lok sabha.
The Vice President of the United States is the constitutional officer who presides over the Senate. The president pro tempore presides over the Senate if the VP is unavailable.
Vice President of India who is the Ex-officio Chairman of Rajya Sabha presides the meetings of Rajya Sabha.
'les cabinets' is another word for the toilet, or it can mean a study (a private room where you write, think and work) and has become to mean the personal secretariate of an important official or politician over which presides 'un chef de cabinet'.