Avaya came in at #10.
Go to http://www.forbes.com/sites/jacquelynsmith/2013/12/10/americas-happiest-companies-2/ to read the article.
To determine the ranking–now in its fourth year–CareerBliss collected thousands of company reviews in which employees assessed the key factors that affect work happiness including: work-life balance, one’s relationship with his or her boss and co-workers, job resources, compensation, growth opportunities, company culture, company reputation, daily tasks and job control over work performed on a daily basis.