James Brady, who died Tuesday at 80, was a longtime member of the New York Post family.

In a career spanning several decades, he was at home in the worlds of politics, entertainment, fashion and literature.

Brady hung out with the rich, the famous and the powerful, chronicling their doings and passing along the best parts.

Brady conceived The Post’s celebrated Page Six and edited it for three years back in the ’80s; he also served a stint as the paper’s deputy publisher.

His other journalistic achievements included positions as editor of New York magazine (succeeding its founder, Clay Felker); foreign correspondent for Fairchild Publications; editor of The Star; publisher of Women’s Wear Daily; Emmy-award-winning local TV reporter, and columnist for both Parade magazine and Advertising Age.

Readers of these pages knew him best for his op-eds saluting his fellow Marines – particularly those who fought alongside him in Korea, where he led a rifle platoon and earned a Bronze Star.

He wrote several books on the conflict, including “The Coldest War,” “The Marines of Autumn,” “The Scariest Place” and, most recently, “Why Marines Fight.”

For all his many adventures in life, he wrote not long ago, none “matched the intensity, the gravitas and the sheer excitement” of combat.

He would know. Rest in peace.