On behalf of the local organizing committee, it is a great pleasure for me to wish you all welcome to the 10th triennial congress of the International Society of Theoretical Chemical Physics, ISTCP-2019. With a combination of excellent science and a unique location 350 kilometers north of the arctic circle, the conference will provide a unique opportunity to be updated on the latest scientific development and to develop new scientific ideas.

The program of the conference follows the successful recipe of earlier conferences, and will consist of plenary speakers and invited talks in a series of parallel sessions. In addition there will be poster presentations that are open to contributions from all participants. The compact and centrally located venue, in combination with the fresh arctic air and a sun that will never set during the time of the conference, should help create an atmosphere that stimulates scientific exchange.

For many, the conference will be the first opportunity to visit the arctic and Tromsø in particular (though hopefully not the last), and I encourage you use the opportunity to also explore larger parts of Northern Norway either prior to or after conference. We will organize several tour options for the free afternoon of the conference, as well as the option to participate at a midnight sun concert or to take a cable car (or hike) to the top of a mountain overlooking the entire Tromsø city.

I look forward to welcoming you to the 10th congress of the ISTCP 2019.

Kenneth Ruud (Chair)