His popularity was at its peak in the late 70s and through the 80s. I own quite a few of his albums, and while I stopped following his career as closely as I once did, I still enjoy those albums. My favorite was the double "The Innocent Age", that contained "The Leader of the Band" and "Same Old Lang Syne" among other truly wonderful songs that never got the wide-spread play of those two standouts.
Dan Fogelberg died yesterday of prostate cancer at the age of 56. His music never failed to please and at times it had true greatness. May he rest in peace. I, for one, will miss him.