Cantor Chief Executive Officer Howard Lutnick, whose firm lost more than 600 people in the Sept. 11 attacks, said the former president will make remarks and take questions. The three-day conference for current and prospective clients begins Sept. 25. Obama will be paid about $400,000, according to a person familiar with the arrangement.

“Everybody would like to come,” Lutnick said. “Hopefully, we will really talk about the Affordable Care Act in interesting and nuanced ways, which I think is really cool.”

Private Island

Obama’s appearance at the Carlyle conference in Washington was previously unreported. The private equity giant has enjoyed some of the best political connections in the world, with executives and advisers who have included former presidents, prime ministers and cabinet secretaries. Obama discussed his life and the decisions he made in the White House, the people who heard him said. A spokesman for the firm wouldn’t comment.

The ex-president has been busy. His foundation is raising money for a library in Chicago, and he and his wife signed a book deal with Penguin Random House after an auction that went above $60 million, according to the Financial Times. He spoke about food in Milan, democracy in Jakarta and himself at an A&E Television Networks event in New York. He vacationed in California and Hawaii and on Richard Branson’s Necker Island with its billionaire owner.

Obama has picked private equity, hedge fund, venture capital and banking veterans to oversee his foundation, and an alumnus of Goldman Sachs Group Inc. to advise him on investments.

Northern Trust is a bank that specializes in wealth management for rich families and services for big funds. The event had gone unreported, but a program accessible on the firm’s website lists Obama alongside executives from Microsoft Corp., IBM and Michael Bloomberg, majority owner of Bloomberg LP.

Northern Trust, based in Chicago, gave Obama a discount on a $1.32 million loan for a mansion in that city in 2005, after he was elected to the Senate, the Washington Post reported. The rate was changed to account for an offer from another lender, a spokesman for Obama said three years later. Doug Holt, a spokesman for Northern Trust, wouldn’t comment for this story.

Imperial Ballroom

Obama is getting advice on investments from Robbie Robinson, who’s on leave from BDT & Co., according to a person familiar with the arrangement. That Chicago-based firm works with wealthy families and is run by Byron Trott. Both bankers worked for Goldman Sachs.