Despite his brilliance as a 19th century Hall of Fame manager, the Orioles’ Ned Hanlon has eluded the scrutiny of a book-length biography — until now.

More than 125 years after he led Baltimore to three straight baseball championships, and a quarter-century after his induction at Cooperstown, the life of the crafty strategist known as “Foxy Ned” has finally received the attention it has long deserved.

“Hanlon had a huge influence on the transition of the game, from its rough draft in the 1880s into modern baseball. Two of his players, [managers] Connie Mack and John McGraw, took his system and made it standard for baseball tactics,” said Jay Seaborg, who chronicled Hanlon’s life with co-author Tom Delise. Retired now, they met while teaching at Century High in Carroll County. Seaborg taught history; Delise, English.

Armed with an intellectual curiosity and a passion for sports — both men coached high school teams — they honed in on Hanlon, the oft-forgotten mastermind of the 1890s Orioles. The book, “Foxy Ned Hanlon,” was published in April.

On Saturday, the authors will highlight Hanlon’s baseball life at the Babe Ruth Birthplace and Museum from noon to 2 p.m., following a two-hour autograph signing by the Orioles’ current manager, Brandon Hyde.

Like Hyde, Hanlon took a last-place Orioles team and turned it into a winner. His deft trades and use of “scientific” tactics — the squeeze play, bunt and hit-and-run — helped make Baltimore a storied club of yore. The Orioles won three consecutive National League championships, from 1894 through 1896, the last of which went 90-39 (.698) and spawned seven big league managers, including McGraw, Hughie Jennings and Wilbert Robinson.

That it took so long for Hanlon to reach the National Baseball Hall of Fame is puzzling, said Delise, 69, who lives two blocks from Hanlon’s residence on Mount Royal Ave. in Baltimore.

“He ran his team with an iron fist, but he was worshipped by his players,” Delise said. “Hanlon gave his players an idea and then let them institute it; that’s the mark of a good teacher. He empowered them, and players respected him for that.”

Yet Hanlon never got his due, the authors said.

“We could stand outside Camden Yards, before an Orioles game, and randomly ask 1,000 people if they know who Ned Hanlon is, and maybe 10 would know,” said Seaborg, 69, of Mount Airy.

Hanlon would surely pass muster on the 2024 Orioles.

“He’d love the way these guys play, with their aggressiveness and attention to fundamentals,” Seaborg said. “For all of their reputation as rowdy ballplayers, their care for the fundamentals set those old Orioles apart. People came to the ballpark just to watch them warm up.”