Notable cases he was involved included leading the antitrust inquiry into Microsoft.
Apple intentionally deleted music not bought from iTunes from users' iPods between 2007 and 2009, a court was told in a antitrust suit against Apple.
Attorneys representing the plaintiffs in a potentially billion dollar antitrust class-action lawsuit against Apple for abuse of its iTunes Music Store dominance told the jury that the Californian electronics company scanned for music not bought from iTunes, and forced a factory reset of the iPod if any was detected.
In March, when the boss of AT&T, America's second-biggest mobile-phone operator, declared that his firm would buy T-Mobile USA, the number four, for a whopping $39 billion, he seemed convinced that the deal would pass antitrust muster.
If an antitrust investigation by the European Commission is settled along the lines agreed on in February, Google will have a different look in Europe from that in America.The best thing about the court's decision is that it has revived the debate on how (and whether) the internet should be regulated.
Because they cannot afford to rest on their laurels, high-tech heavyweights often foster aggressive corporate cultures that draw the attention of antitrust regulators.
America's regulators and antitrust officials have, until now, viewed their expansion into other markets with caution.
Under the new laws, CADE, the competition authority, would shift its emphasis towards looking at potential mergers, rather than at mergers after they have happened.However, it is not fair to say that "antitrust policy has long been weak in Brazil".
Most famously, he broke up the "trusts", the powerful corporate monopolies that dominated late-19th-century America, by bringing 44 antitrust cases in seven years.Mr Bush, by contrast, thinks the current crisis stems from a few bad-apple chief executives rather than the system as a whole.
But to salvage it, AT&T must fight a long battle in court at a time when the Obama administration is signalling a tougher approach to antitrust enforcement.
The merger would be good for consumers: it would give them a choice between two strong national companies; it would let the firm expand its fourth-generation (4G) networks, not least in rural areas; and it would alleviate the shortage of radio spectrum.After five months of digging, America's antitrust regulators disagree.
