Position: Classroom Teacher Subject Area: Mathematics Job Title: 7th and 8th Grade Math Teacher Job Location: Wissahickon Charter School Beginning: Immediately Deadline: Open until filled Certificate: Mathematics 7-12 Certificate: Middle School Mathematics 7-9 District: Wissahickon Charter School Philadelphia, PA 19144 Telephone: 267-990-7771. Classroom Teacher - Mathematics 7-12 Job Listing - Wissahickon Charter School, Philadelphia, Connecticut.