There are 9 books in the The Dragon Knight Series series. The newest book is The Dragon and the Fair Maid of Kent which came out in 2000.

Through no fault of his own, the once human Jim Eckert had become a dragon. Unfortunately, his beloved Angie had remained human. But in this magical land anything could happen. To make matter worse, Angie had been taken prisoner by an evil dragon and was held captive in the impenetrable…
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The Dragon Knight

The Dragon Knight
The victim of a series of transformations, twentieth-century American mathematician Jim Eckert struggles to control his magical abilities as a dragon and to learn his knightly responsibilities as a fourteenth-century English baron

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The Dragon on the Border

The Dragon on the Border
The sequel to "The Dragon Knight" chronicles the adventures of Sir James--the Dragon Knight--as he battles the Hollow Men, vengeful spirits of the dead that appear as hollow suits of armor and that can regenerate themselves

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The Dragon at War

The Dragon at War
Magically transported to medieval England and empowered with special gifts, Jim Eckert is challenged to protect England from an invasion of the French army, which has aligned itself with the mighty serpents of the deep.

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The Dragon, the Earl, and the Troll

The Dragon, the Earl, and the Troll
Finding himself in a parallel universe ruled by magic, Jim Eckert, a twentieth-century college professor, uses his ability to turn into a dragon to fight the Dark Powers that threaten the course of history and the life of Jim's unborn child.

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The Dragon and the Djinn

The Dragon and the Djinn
An exciting fantasy adventure by a Hugo Award-winning author continues the story that began with The Dragon on the Border and The Dragon, the Earl, and the Troll.

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The Dragon and the Gnarly King

The Dragon and the Gnarly King
In the sequel to The Dragon Knight, a young mathematician from Earth travels to a parallel medieval world of sword and magic where he gains the ability to transform himself into a dragon and now must save his son, who has been kidnapped by his sworn enemies. 25,000 first printing.

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The Dragon in Lyonesse

The Dragon in Lyonesse
Mathemetician Jim Eckert, who has come to live in magical medieval times and can become a dragon at will, returns in a new adventure that makes him the unlikely ally of King Arthur and his Knights of the Round Table. 15,000 first printing.

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The Dragon and the Fair Maid of Kent

The Dragon and the Fair Maid of Kent
Gordon R. Dickson has entertained readers for over two decades with his tales of Jim Eckert. Now the Dragon Knight must confront the three disas-ters that lie in wait for any visitor to the English Middle Ages: war, plague, and Plantagenets. The plague is caused by a covert invasion of…