The Business Analysts are key members of the teams, into organizations. They gather and analyze the business and stakeholder information, collaborate between managers, developers and users etc. According to Wikipedia, the Business Analysis activity is even wider.
If we look across companies, we can see the Business Analysts involved in planning, analysis, validation, modeling. These are activities present in both Waterfall and Agile environments.
Anyway, there are three core areas of activities where the Business Analyst can leverage his experience from Waterfall methodology, where he can add most value in an Agile environment:
Whilst the last two ones are specific especially to the software development, the first one is widely important inside and between different teams, individuals and even in B2B relations for a specific company.
If you are interested in details, please read this article.
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