Many other academic fields have notable contributors. There are many well known names of Scientists, Philosophers, Mathematicians, Law, Psychologists, etc..
Who are the Einsteins or Curies of academic History, and what were their contributions?
"Rockstar" suggests, at least to me, "widely known". You have historians who are widely known within their subdiscipline, or primarily famous outside of academia.
In the Netherlands, I'd argue that Maarten van Rossem (one-time endowed professor at the University of Utrecht) qualifies. He's mainly known for... well... being Maarten van Rossem, and his academic record is not at all that impressive. He's the public face of historians, though. For better or for worse.
Niall Ferguson is of a similar mold. Nowadays primarily known for his cash grab documentaries/books, being a conservative/republican icon, and being married to Ayaan Hirsi-Ali, Time Magazine once called him one of the most infuential people in the world. I'd say that his The Pity of War is an interesting book, and his early work on the Rothschilds is also supposedly very good.
Other than that, I'd say that most "rockstar historians" are rockstars within their own little "genre". Most historians are influential in their own field, and their ideas might cross-over via other historians. Anyway, some "historians" who probably cross-over are:
Benedict Anderson - hugely influential through his book Imagined Communities which permanently changed the way historians frame the concept of nationalism.
Hayden White and Frank Ankersmit - Important philosophers of history, "founders" of narrativism. Narrativism holds that "the past" cannot be described, and that the historian's work is ultimately a fiction through the framing of the past in a narrative. A good literary exploration of this metahistorical position is Laurent Binet's novel HhhH.
Carlo Ginzburg and Emmanuel Le Roy Ladurie - Proponents of "microhistory" and cultural history. Especially Carlo Ginzburg's The Cheese and the Worms is an amazing read. It reconstructs a miller's cosmological view through records of the inquisition, and study of the texts the book's subject said to have read.
What about Edward Gibbon, the British historian who wrote Decline and Fall of the Roman Empire?
Gibbon is not followed today, but his attempt to trace the cause of Rome's fall to some moral failure, and use that as a lesson for contemporaries, made him as hugely popular and influential then as he is discredited now. His theory is also the archetype for other modern analogies, however inapt, between Rome's fall and modern American politics.