Update regarding the coronavirus/COVID-19 pandemic

Dear Colleagues:

It is with great disappointment that we are announcing the cancellation of the 20th Conference of the IHSS in Estes Park, Colorado, USA and instead we are planning to hold a virtual meeting in 2021. Anyone who paid a registration fee will receive a refund within the next couple of weeks. We have discussed the 20th Conference at length with the IHSS Board and came to the conclusion that this was the only reasonable course of action. Although there is hope for an end to the COVID-19 pandemic with the recent release of several vaccines, the timeline for vaccinations to occur is still very much unclear, not only in the USA but around the world. Thus, all of this uncertainty regarding the progress of vaccinations as well as the ability to travel within and between countries makes it extremely challenging for attendees to plan a trip to Colorado, especially for those coming from outside the USA. We were concerned about the likelihood of very low attendance at an in-person meeting as well as the safety of our friends and colleagues who elected to attend the meeting, many of whom would need to travel great distances. 

As a substitute for an in-person meeting, the plan is to hold the 20th Conference of the IHSS virtually. We are currently working on plans for hosting this virtual meeting and more details will be forthcoming. The expectation is that virtual meeting will be held on similar dates as the rescheduled in-person event, August 15-21, 2021. We realize that a virtual meeting is not the same experience as getting to see friends and colleagues face-to-face. Nevertheless, we consulted with the IHSS Board and all were in agreement that the Society membership needs to get together somehow in order to discuss science, share ideas, and conduct the business of the Society. We simply cannot wait another year to have a meeting.

In closing, although you may be disappointed upon hearing the news about the in-person Conference in Estes Park, we hope that you will be able to take time to join us for the virtual meeting. We also hope that you remain safe and healthy, and we look forward to seeing you on-line this August at the virtual meeting.

Ray Hozalski and Fernando Rosario-Ortiz

IHSS 2020 Co-organizers

Important Conference Information


Important Dates

  • IHSS2020 is still accepting abstracts for posters!
  • June 1 – Early bird registration deadline (reduced registration cost).
  • June 16 – Deadline to reserve a room for the conference with YMCA of the Rockies.

Quick Links


Dr. Fernando Rosario-Ortiz & Dr. Ray Hozalski are the organizers of the 2020 IHSS Conference.  Dr. Rosario Ortiz is a professor of environmental engineering at the University of Colorado and Dr. Hozalski is a professor of environmental engineering at the University of Minnesota.
This conference is being organized in collaboration with the International Humic Substances Society.



The conference and lodging will be at YMCA of the Rockies in Estes Park.
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Transportation options are available from Denver International Airport (DEN) and around Estes Park.
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Field Trip

Tour of beautiful Rocky Mountain National Park.
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Choose from rafting, zip-lining, hiking, archery, horseback riding.
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Social events

Outdoor cookout, music, banquet dinner with live music and square dancing.
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Scientific Committee

  • Yiannis Deligiannakis, University of Ioannina
  • William Becker, Hazen and Sawyer
  • Thomas Borch, Colorado State University
  • Deborah Dick, Federal University of Rio Grande do Sul
  • Raymond Hozalski, University of Minnesota
  • Heike Knicker, Instituto de Recursos Naturales y Agrobiología de Sevilla
  • Julie Korak, University of Colorado, Boulder
  • Diane McKnight, University of Colorado, Boulder
  • Teodoro Miano, University of Bari Aldo Moro
  • Kathleen Murphy, Chalmers University
  • Fernando Rosario-Ortiz, University of Colorado, Boulder
  • Roger Swift, University of Queensland
  • E. Michael Thurman, University of Colorado, Boulder
  • Jianming Xu, Zhejiang University