Do you know a woodworker? It would be a simple matter for a woodworker to use excess flooring to make the reducer Oak & Broad referenced. Then when stained/finished, it matches.

Kinda like this:

Some type of overlap reducer would work. Really poor planning on the part of the installer unless it's a floating floor.

A little difficult to tell if the height of the flooring and carpet are the same. The new floor looks higher. I had the same problem when I laid bamboo that butted to berber carpet, but I also mesured to make sure the heights would match before I laid the floor. Used a T transition strip of the same material and color as the bamboo, and it looks great. If the new flooring and carpet are not the same height, I yield to the pros. Personally, I would not want a T transition with a gap on the carpet side. I do think there are transition strips designed for unequal heights, but again I yield to the pros.

The carpet should not have been cut back so far and the wood should be cut straight across, not jagged like how it's shown in the photo. A simple Z bar would have fixed this issue without having to purchase a wood transition that could break over time due to people stepping on it. And yes, it can break if one side of the transition is on the wood (hard surface) and the other side is on the carpet (soft surface). The soft surface will allow flex in the transition which will cause it to crack and break.

A Z Bar is installed under the carpet and allows one end to be tucked leaving a clean finish bumping up to your wood.

Photo shows carpet to tile but gives you an idea of the finished layout.

Not sure how wide the gap is between the areas but a professional carpet installer can possibly stretch your carpet and still use the Z bar to finish properly.

First thing would be to put an unfinished oak reducer down to that subfloor to cap the edge of the wood, then the carpet could be finished to it by z-bar or tuck or however.

If your flooring guy couldn't figure that out, you obviously had the wrong guy. You're paying him to figure it out, otherwise you could've done it yourself, right? Kind of ridiculous that he told you to figure it out.

Thank you all! (and yes - it is a floating floor). This is extremely helpful. I'm going to make him even out the wood so that it is a nice straight line and then bring in a carpet guy to do it right (because there is no way my guy is going to figure this out). Thanks, again!

Don't expect a wood installer to understand how to finish out carpet. They are 2 different animals and 2 different sets of tools needed for both applications. My wood crews don't carry around a carpet stretcher or knee kickers, it's not their job.