Mathematician - Calculus Expert -- 2

I am looking for an experienced Mathematics expert specialized in Calculus to take up part-time consultant role. Preference given to those with in-depth knowledge and understanding of the subject. The consultant needs to possess advanced proficiency and should have a good track record of solving challenging mathematical problems, and providing solutions for the same. The ideal candidate will have the ability to explain Calculus with lucidity, and have essential skills in problem-recognition, problem-analysis and resolution. The consultant should be comfortable with working flexible hours, and provide calculations, solutions and explanations in an efficient manner while offering relevant advice and insights.