Character Animation - Inverse Kinematics - Motion Animation

I am looking for a seasoned expert in Adobe After Effects character/motion animation and inverse kinematics to provide hands on technical guidance for a creative animation project. We will hope you have some knowledge/familiarity of expressions for things such as gravity, inertia, momentum etc The composition will include two subjects dancing and interacting with one another and will require realistic body movements involving complex character rigs. Particularly important will be the ability to have the puppets have realistic upper body full spinal IK transformation, with a lower torso, upper torso, neck and head rig, so as to create the realistic visual effect of leaning over, leaning back, hunching forward, while tipping the head up and down, etc. We will have all the layers prepared and will need to work collaboratively with you to explain the effects we're looking for, create the rigs, help us understand the controllers/dependencies/expressions and show us how to use them. You can anticipate that this will be an ongoing project that will involve multiple iterations and updates/enhancements and additions moving forward, so if we can find the right resource there will be a lot of work to come beyond this project :) Please only apply if you have a current piece of work that displays the type of effects we've just described.