I would attempt to work on the 'Wing first and follow the protocols at mytpi.com (registration required): physical causes and solutions

http://www.mytpi.com/mytpi05/swing/swingfaultdetail.asp?SF_ID=3

Ryan Crysler
Head Instructor
My Golf Performance Center
512.850.5721
mygolfperformance.com

Towel drill!   go to the driving range put a small towel under your left arm pit if your a right handed golfer. the towel shouldnt fall untill your completly facing the target and the club is behind you. it simple its cheep and it works.   If you start hooking the ball doing this it means your swing plane is to flat.

Josh,

Keeping it simple, the chicken wing is showing you that your swing is out of sequence, meaning that your lower body is not initiating the downswing.  When your arms start the downswing they are forced to release early and before crashing into the ground (which probably happens sometimes!) you left arm pulls the club upward to remove it from it's steep path.  Work on transitioning into your left side to start your downswing, and then on opening your hips towards the target.  These two acts will help swing your arms, allowing them to be fully extended at impact and beyond!  Good luck.

cheers

simba

Chicken Wing  

It's a great thing isn't it. One of the things that I have not seen anyone post yet is going to be the release of your club down the line towards your target. If you do not extend your hands down the line and release the club ( rotating your forearms as if your trying to turn your right forearm to your left) your swing will not be complete and then the chicken wing. Your follow thru will be much easier if you release the club. Your arms will properly hing to a nice full finish.

Josh

Both your chicken wing and head position are the result of an improper back swing.  Solution is simple, keep your left arm (for right handed) straight and turn your torso(upper body) during the back swing. Lead the down swing with the hands by dropping them ( club still cocked) releasing them and driving the club head thru the ball.  Practice the straight arm until it is part of your swing. If you bend your arm on the backswing it stays bent thru the entire swing sequence and you end up leading with your bent left elbow.

I hate the dreaded chicken wing. Hard to get rid of some times ......

There could be physical reasons, too.  Your lead arm strength could be weak or you could have limited rotation in your lead shoulder.   A TPI certified trainer/ or pro could run you through a quick assessment and give you some simple exercises to help strengthen your wrist, arm or shoulder.