Feedback from massive stars is the main driver of secular evolution in galaxies with masses similar to or smaller than the Milky Way, across the entire redshift range. Indeed, state-of-the-art numerical simulations of star-forming molecular clouds and galaxy evolution cannot reproduce key observables (e.g. the star formation rate vs. stellar mass relation) without accounting for stellar feedback. Therefore, feedback from massive stars represents one of the main uncertainties in numerical star formation and galaxy evolution studies.

The missing ingredients towards making significant progress in the field are observational constraints on the numerical models as a function of cosmic time and environment, as well as meaningful ways of comparing models and observations. In view of the ongoing and upcoming dedicated, legacy-value feedback surveys in nearby galaxies, this Aspen meeting brings together observers and theorists, both from the nearby and high-redshift communities. Combining these different communities will enable the problem of stellar feedback to be addressed comprehensively and holistically, thereby greatly improving the predictive power of galaxy evolution models.

Scientific Organizers

Anna McLeod, Durham University

Diederik Kruijssen, Universität Heidelberg

Mark Krumholz, Australian National University

Linda Tacconi, Max Planck Institut für Extraterrestrische Physik

Invited Speakers

Mélanie Chevance, Universität Heidelberg

Alice Shapley, University of California Los Angeles

Eve Ostriker, Princeton University

Rob Crain, Liverpool John Moores University

Desika Narayanan, University of Florida

Physics Café & Public Lecture

The speakers of the Wednesday ACP Physics Café and the Public Lecture will be announced after the participant list has been finalised.

Important Information

Important details regarding the meeting are listed below. For futher information, please fill out the contact form below, or directly contact Anna McLeod. We will monitor the worldwide COVID-19 situation closely and provide updates if necessary. For now the meeting will take place as scheduled (last update: May 2020).


Application will open in late July / early August via the ACP webpage.
The application deadline is October 31, 2020, and the conference fee is $400. Please contact the conference orgnizers should you need financial assistance, a limited amount of funding will be available for this purpose.


The final program will be available early December 2020.

Morning sessions will run from 8:00 a.m. until 11:00 a.m., these include a 30 minute coffee and poster session break. On the morning after the conference dinner, talks will begin at 9:00. Afternoon sessions will run from 4:00 p.m. until 7:00 p.m.


The meeting will take place at the Aspen Center for Physics. The ACP is located a short walk from the Aspen city center, and the skilifts can be conveniently reached with public transport.

Code of Conduct

Please make yourself familiar with the Code of Conduct.


Code of Conduct

The organizers of this conference are committed to making this meeting productive and enjoyable for all participants and free from any form of discrimination, harassment, or retaliation. Participants will treat each other with respect and consideration to create a collegial, inclusive, and professional environment at this conference. Creating a supportive environment to enable scientific discourse is the responsibility of all participants.

Participants will avoid any inappropriate actions or statements based on individual characteristics such as age, race, ethnicity, sexual orientation, gender identity, gender expression, marital status, nationality, political affiliation, ability status, educational background, or any other characteristic protected by law. Disruptive or harassing behavior of any kind will not be tolerated. Harassment includes but is not limited to inappropriate or intimidating behavior and language, unwelcome jokes or comments, unwanted touching or attention, offensive images, photography without permission, and stalking.

Violations of this code of conduct policy should be reported to the meeting organizers. Sanctions may range from verbal warning, to ejection from the meeting without refund, to notifying appropriate authorities. Retaliation for complaints of inappropriate conduct will not be tolerated. If a participant observes inappropriate comments or actions and personal intervention seems appropriate and safe, they should be considerate of all parties before intervening.


ACP will block 35 rooms at the Aspen Meadows hotel. Given that these are rather large rooms, we encourage participants to share rooms if possible. If necessary, agreements with other hotels in Aspen are available. Room reservations will be available through a link from the ACP registration page.

Social Activities

ACP will host a registration and Wine & Cheese reception on Monday night from 5:00 to 7:00 p.m.

The conference dinner ($70 per person) will be held at the Aspen Meadows on Thursday night. At the conference dinner we will also announce the recipient of the Block Award.

We will have 5h breaks between morning and afternoon sessions. We highly encourage participants to use these for collaborative winter activities! Discounted lift tickets will be available at the time of registration, or during the conference from ACP staff.

Get in touch