Dennis Eisenberg (Earth 2)

Dennis Eisenberg is a billionaire and the vigilante known as The Arrow who works alongside his sidekick, Doug Matthews/The Hood, and the father of the late Barry Eisenberg.

Shipwreck
In 2040, during a voyage at sea with his son, Barry, and buddy, Doug, Robert (along with Doug) was presumably shipwrecked, while Barry perished. Dennis was originally believed dead until unknown circumstances lead to his return to civilization.

Becoming the Arrow
Years after Barry's death, he returned to Portland with his "new son", Doug, and became the vigilante named The Arrow. He also became a renowned hero of Oregon, together with Doug. In early 2059 his identity was revealed on live television.