Answer the question at the end by quoting:

For the upcoming film about the superhero character, see Aquaman (film). Aquaman is a fictional superhero appearing in American comic books published by DC Comics. Created by Paul Norris and Mort Weisinger, the character debuted in More Fun Comics #73 (November 1941). Initially a backup feature in DC's anthology titles, Aquaman later starred in several volumes of a solo comic book series.
Aquaman's first origin story was presented in flashback from his debut in More Fun Comics #73 (November 1941), narrated by the character himself:  The story must start with my father, a famous undersea explorer--if I spoke his name, you would recognize it. My mother died when I was a baby, and he turned to his work of solving the ocean's secrets. His greatest discovery was an ancient city, in the depths where no other diver had ever penetrated. My father believed it was the lost kingdom of Atlantis. He made himself a water-tight home in one of the palaces and lived there, studying the records and devices of the race's marvelous wisdom. From the books and records, he learned ways of teaching me to live under the ocean, drawing oxygen from the water and using all the power of the sea to make me wonderfully strong and swift. By training and a hundred scientific secrets, I became what you see--a human being who lives and thrives under the water.  In his early Golden Age appearances, Aquaman can breathe underwater and control fish and other underwater life for up to a minute. Initially, he was depicted as speaking to sea creatures "in their own language" rather than telepathically, and only when they were close enough to hear him (within a 20 yards (18 m) radius). Aquaman's adventures took place all across the world, and his base was "a wrecked fishing boat kept underwater," in which he lived.  During his wartime adventures, most of Aquaman's foes were Nazi U-boat commanders and various Axis villains where he once worked with the All-Star Squadron. The rest of his adventures in the 1940s and 1950s had him dealing with various sea-based criminals, including modern-day pirates such as his longtime archenemy Black Jack, as well as various threats to aquatic life, shipping lanes, and sailors.  Aquaman's last appearance in More Fun Comics was in issue #107, before being moved along with Superboy and Green Arrow to Adventure Comics, starting with issue #103 in 1946.

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Aquaman's first origin story was presented in flashback from his debut in More Fun Comics #73 (November 1941), narrated by the character himself:

IN: Spitz was born in Modesto, California, the first of three children of Lenore Sylvia (Smith) and Arnold Spitz. His family is Jewish; his father's family was from Hungary and his mother's, originally surnamed "Sklotkovick", were from Russia. When he was two years old, Spitz's family moved to Honolulu, Hawaii, where he swam at Waikiki beach every day. "You should have seen that little boy dash into the ocean.

In 1972, soon after his return to the United States, Spitz landed several lucrative corporate endorsement contracts. He earned about $7 million in a two-year period. However, as the memory of his feats receded, so did his endorsement and promotional deals. As his endorsements faded he started a successful real-estate company in Beverly Hills. He bought a Ferrari and says he made more than $1 million. "A million dollars in 1972 would be equivalent to more than $10 million today," Spitz said. "I did very well, thank you very much." "I would say I was a pioneer. There wasn't anyone who'd gone to the Olympics before me who capitalized the same way on opportunity. It depends on timing, it depends on hype, it depends on the economy, and most importantly, it depends on looks. I mean, I've never seen a magazine of uglies. That's our society. I'm not saying it's right. That's just the facts."  Per his official website, Spitz is self-employed as a corporate spokesperson and motivational speaker. However, Sports Yahoo! lists his occupation as a stock broker and motivational speaker. According to a recent interview "Spitz became a stockbroker in 2002 and has since moved into private equity. He is now also dabbling in the "water business," as he calls it, and is in negotiations to build a water-bottling facility on aquifer-rich land that he and a business partner own.  He has pursued various entrepreneurial projects with former NBA player Rick Barry. He travels the world delivering about 25 lectures a year. His biography, The Extraordinary Life of An Olympic Champion by Richard J. Foster, was released in July 2008.  In July 2012 he endorsed Istanbul's bid to host the 2020 Summer Olympics.

What else did he do after his swimming career?

OUT:
As his endorsements faded he started a successful real-estate company in Beverly Hills.