I consider Dr. Ari Kiev as the best Market Psychologist and his insights are more practical and to the point for serious traders. He is regarded as the top psychologist by many Hedge Funds. I have no affiliation with him or his company but I respect his work and value his research. He also has 4 very popular books.
Here is Dr.Kiev's Podcast journal
http://www.arikiev.com/feed.xml
Regards,
Suri