There is no official title of "Czar" within the Executive Branch of the United States government (or any other branch, for that matter). In fact, this is a term created by the media, and it has been in use since the time of President Nixon in the 1970s.
Those whom critics (and the media) have called "Czars" are usually experts and advisers, specially brought in by a president to give advice or handle a specific area of policy. For example, the "Car Czar" is actually the head of the Presidential Task Force on the Automobile Industry, and is a former auto industry executive with expertise in that area of business. There is no evidence that President Obama has any more "czars" than other presidents have had.
I enclose a link to some of the so-called "czars" who have worked for various presidents; it also lists what their areas of expertise were.
Abraham Lincoln
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47.
President Obama doesn't have a son.
The president and the cabinet. Also the Vice President and all the Czars and their staffs.
Senator.
Michelle Obama
Joe Biden
The president appoints federal judges, ambassadors, cabinet members and various "czars".
First, it should be noted there is really no such thing: this is a political and media term that has been used for about five decades to refer to men (and later women) from the private sector who were brought in by a president to work in the administration because they could offer special expertise. These "czars" were experts in the automobile industry or in green energy or in social media or some other interesting area of policy. Contrary to internet myths, President Obama has used about the same number of "czars" as President Bush did. Every president uses experts, and Mr. Obama is no exception. One example in the Obama administration is Steve Rattner, who signed on as the "car czar" due to his experience with finance (especially with bank loans to corporations); Rattner helped to structure and then supervise the president's rescue of the auto industry.
Ann Dunham
He is President-Elect Obamas senior advisor.