Doncaster created a host of first-half chances but had to wait until the 47th minute before breaking the deadlock when James Hayter headed home Brian Stock's corner.
Victory secured Doncaster a third promotion in five years and a return to the second tier of English football for the first time in 50 years.
"Five years ago we were in non-league football and Leeds were playing in the Premier League. David beat Goliath here and I think quite deservedly too," Ryan added.
"I can't imagine another team has gone from the Conference to the Championship as quickly as we have."
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