Ib Kofod or "in the style of?"  

If there is a Selig mark or Made In Denmark stamp on this chair design, then it is a legit Kofod Larsen design. However, not all legit K-L chairs are marked.

There are also very similar chairs made by the Shield Chair Company, which was based in California, As per this thread, it does not appear that K-L designed for Shield.

https://www.designaddict.com/forum/Identification/Shield-Chair-co-California

Look closely at all the details. The mark, or lack thereof, is only one indicator in a constellation. And bear in mind that often the details you most care about are in the areas that aren't intended to be seen. That is where you can spot that it was indeed made by the same factory, with the same materials, jigs, tools etc.