In other industries like tech and media, all of the big players’ CEOs are on Twitter – Marissa Mayer, Steve Forbes and Michael Dell, just to name a few. But leaders of big healthcare companies haven’t shown as much gusto in that regard.

It’s somewhat of a novelty to find an active top executive of a hospital, pharmaceutical company, medical device company or insurer on Twitter, so when we found these, we had to share. These execs are tweeting not just about their companies but about entrepreneurship, policy and healthcare in general.

Mark Bertolini, chairman and CEO, Aetna (@mtbert). A true pioneer in this realm, he actually responds to tweets from customers.

Omar Ishrak, president and CEO, Medtronic (@MedtronicCEO). These days, the Medtronic CEO is much more apt to sharing 140-character tidbits of his life and Medtronic – his account is significantly more active than it was this time last year.

Laurent Levy, CEO, Nanobiotix (@nano_inmedicine) tweets about current events and innovation in nanomedicine.

Glen Giovannetti, global life sciences leader, Ernst & Young, (@GlenGiovannetti) tweets about biotech, entrepreneurship and patient-centered care.

John LaMattina, senior partner, PureTech Ventures and former president of global R&D, Pfizer (@John_LaMattina) shares lots of useful news and thoughts on pharma.

Dennis Urbaniak, VP U.S. Diabetes, Sanofi-Aventis (@DUrbaniak) tweets about marketing, social media and healthcare deals.

Jonathan Bush, CEO, athenahealth (@Jonathan_Bush) isn’t as active lately, but he has tweeted more thoughts and ideas on healthcare than most of the others on this list.

Michael Pellini, CEO, Foundation Medicine (@MichaelPellini) responds to feedback and shares articles on technology and medical research.

Bruce Siegel, CEO, National Association of Public Hospitals and Health Systems, (@siegelmd) shares articles and thoughts on technology and health policy.

Wayne Guerra, co-founder, iTriage, (@WayneGuerra) is an ER doc and mobile health entrepreneur who gives good perspective on issues for hospitals and doctors.