He may have invented character assassination as a Progressive technique (of course there had been earlier victims of slanderous accusations both in the US and elsewhere, but this is now one of the main tools of the trade of the Democratic Party).
Richard Ballinger was Secretary of the Interior in the early part of Taft's Presidency. He and Pinchot disagreed over something and Pinchot launched a smear campaign to paint Ballinger as corrupt. Taft stood by Ballinger and fired Pinchot, which was one of the things that led to the Taft/TR split that doomed Taft's effort to be re-elected in 1912 and caused the nation to be saddled with Woodrow Wilson.
In accepting Ballinger's resignation a while later, Taft said that he had been "the object of one of the most unscrupulous conspiracies for the defamation of character that history can show."
There is a national forest named after Gifford Pinchot in Washington State. I don't think there is anything named after Ballinger.
There is a lake in WA State named after Ballinger. There is also a State Park , and a PSU dorm, among many other things in PA named after Gifford Pinchot.
There is a community on the edge of Seattle and lake Washington named Ballinger. How it got its name, or whom it is named after, I do not Know.