I've been reading some articles about this, and it seems that the prevailing suggestion is to start with the family doctor, who can then refer to a "counselor" who specializes in anger management.

As far as treatment goes, there's a lot of information out there, and the articles I'm finding talk mostly about technique.

From http://www.anger-management-programs.net/anger-management-treatment.htm :

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Self-awareness and stress reduction in respect to certain situations is a popular method of anger management treatment. ... Therapeutic approaches usually include frustration tolerance training as well as meditation and relaxation techniques. A skilled licensed professional will help a client deal with anxiety, guilt, low self-esteem and can accurately identify depression and other emotional disorders that may be complicating anger management treatment.
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From http://www.athealth.com/Consumer/disorders/anger2.html :

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Some of the most empirically supported interventions are cognitive-behavioral interventions including relaxation coping skills, cognitive interventions, behavioral coping and social skills training, and problem-solving skills training.

there are numerous structured and pre-packaged programs for helping people learn to manage their anger more effectively. These programs vary in intended audience, theoretical basis, teaching method, and actual skills and techniques used. A summary of several programs can be found in Anger Management 3: Structured Interventions.
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See: http://www.ericdigests.org/2004-3/anger-3.html for information about the structured interventions mentioned above. These are techniques available to counselors in dealing with clients with anger management issues.

At http://ezinearticles.com/?Anger-Management-Treatment-Options---What-Is-Available-For-You?&id=1157824 , the writer outlines the different types of treatment, including one-on-one counseling, support groups (such as Rageaholics Anonymous), anger management courses, and anger management hypnosis.

I also found this article: How To Help A Friend With Anger Management Problems at http://www.angermanagementtechniques.net/how-to-help-a-friend-who-has-anger-management-problems.php which suggests ways to start the conversation and try to convince the person to seek help.

Some of the tips mentioned include--
*Never use the phrase "you always" or "you never," as this negative approach will most likely put them immediately on the defensive, sparking an angry outburst.
*Present the facts in a positive manner by beginning a conversation by explaining how sometimes their response to certain situations may tend to make others feel uncomfortable and ask if they are aware of it.
*Do not let yourself be drawn into an argument with them which will only tend to exacerbate the situation and do nothing to resolve the situation.
*Break off the talk with positive talk and plan to approach it at a later date.
*Choose a neutral setting, especially one that's on their own turf, so to speak, which will give the other person the feeling of being in control.

Hope this helps.

i am gonna give you advice based on my personal experience
i faced the situation in my past and was extremely violent..(i would break things never hurt anyone.).

i joined aerobic classes to release my physical stress that helped me because instead of using my angry energy on breaking things i was using it to work out..

i also keep clay dough..(the one kids play with)
so every time am stressed i just play with me ..mash it ..smash it..break it..put it back again...
just to relieve stress..you can try those small yellow stress balls..

yes i also played NFS video games..its a racing car game and instead of racing i used to bash and bang the cars everywhere on my way till the finish line

i know its sounds stupid but really works..
try it once,...its a lot cheaper than therapy