Utilize the input text as a context reference, choose the right relationship between Barry Rosenstein and Jana Partners from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Investing alongside powerful activists like Carl Icahn, Pershing Square’s Bill Ackman, Trian Partners’ Nelson Peltz or Barry Rosenstein of Jana Partners can produce big profits.

Answer: employer