Massachusetts DESE is offering various workshops for those needing PDPs in teaching ELLs for recertification.
They are also offering the full SEI endorsement course. Follow the links below for more information:
PDP Course for Recertification (note: Math/Science Specific!):
Academic English for English Learners in Math and Science (EL-106)
SEI Endorsement Course for Teachers:
Massachusetts Sheltered English Immersion Teacher Endorsement Course (RE-600)
SEI Endorsement Course for Administrators:
Massachusetts Sheltered English Immersion Administrator Endorsement Course (RE-601)