Jennifer is an American teacher who is publishing high quality English videos lessons on YouTube. The material is excellent and there are over 110 videos to watch on various topics from Vocabulary to Grammar and including Pronunciation.
In particular, I highly recommend this series on lessons (below) on Pronunciation. If you work through this series and do the exercises the entire way you listen to English will completely change and, in time, your pronunciation will improve dramatically.
Lesson 6a – WORD STRESS
Lesson 6b – WORD STRESS
Lesson 6c – WORD STRESS
Lesson 6d – WORD STRESS
Lesson 7a – THOUGHT GROUPS
Lesson 7b – THOUGHT GROUPS
Lesson 8a – STRESS PATTERNS
Lesson 8b – STRESS PATTERNS
Lesson 8c – STRESS PATTERNS
Lesson 9a – ADVANCED STRESS PATTERNS
Lesson 9b – ADVANCED STRESS PATTERNS
Lesson 9c – ADVANCED STRESS PATTERNS
Lesson 10a – INTONATION
Lesson 10b – INTONATION
Lesson 10c – INTONATION
Lesson 10d – INTONATION