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Service activities

- Co-Organizer of the ``Geometric analysis session" for the event ``Finnish Mathematical Days 2016", University of Turku, Turku, 7-8 January 2016.
- Organizer of the ``Geometric analysis session I and II" for the event ``Meeting for young mathematicians in Finland 2015", Aalto University, Espoo, 26-28 August 2015.
- Reviewer for Zentralblatt MATH and Mathematical Reviews
- Peer Reviewer for Journal of Mathematical Analysis and
Application, Complex Variable and Elliptic
Equations, Computational Methods and Function
Theory, Proceedings of the American Mathematical

Society, Journal of Geometric Analysis, Conformal Geometry and Dynamics, Mathematical Research Letters, Calculus of Variations and Partial Differential Equations and Revista Matematica Iberoamericana.

Invited seminar presentations

- p-harmonic mappings between Riemannian manifolds and singular metric spaces, School of Information and Mathematics, YangTze University. 22 January 2018.
- p-harmonic mappings between Riemannian manifolds and singular metric spaces, Department of Mathematics, Southern University of Science and Technologyy, 12 January 2018
- p-harmonic mappings between Riemannian manifolds and singular metric spaces, Department of Mathematics, Sun Yat-sen University, January 2018.
- p-harmonic mappings between Riemannian manifolds and singular metric spaces, Differential Geometry Seminar, Institute of Mathematics, EPFL, Lausanne, 10 May 2017.
- The theory of quasiregular mappings in metric spaces, Mathematical Colloquium, Mathematical Institute, University of Bern, Bern, 25 April 2016.
- The theory of quasiregular mappings:recent advances and open problems, Geometric Function Theory Seminar, Institute of Mathematics Polish Academy of Sciences, Warsaw, 17 December 2015.
- Inverse problems for p-Laplace type equations under monotonicity assumptions, Analysis, Geometry and PDE Seminar at School of Mathematics and Systems Science, Beihang University, Beijing, China, 30 June 2015.
- Intrinsic geometry and analysis of Finsler structures, Function Space Seminar at School of Mathematical Science, Beijing Normal University, Beijing, China, 29 June 2015.
- The branch set of a quasiregular mapping: recent advances and open problems, Friday Seminar at School of Mathematical Science, Beijing Normal University, Beijing, China, 26 June 2015.
- The branch set of a quasiregular mapping: recent advances and open problems, Analysis, Geometry and PDE Seminar at School of Mathematics and Systems Science, Beihang University, Beijing, China, 23 June 2015.
- Mappings of finite distortion: boundary extensions in uniform domains, Function Space Seminar at School of Mathematical Science, Beijing Normal University, Beijing, China, 23 June 2015.
- Quasiregular mappings between subRiemannian manifolds, Analysis and Geometry Seminar at Department of Mathematics and Systems Analysis, Aalto University, 22 April 2015.
- The branch set of a quasiregular mapping: recent advances and open problems, Geometric Analysis Seminar at department of mathematical analysis, Charles University, 1 April 2015.
- Uniform continuity of quasiconformal mappings onto generalized John domains, Analysis Seminar at Department of Mathematics and Statistics, University of Helsinki, 25 November 2013.
- Generalized quasidisks and the associated John domains, Geometric Analysis Seminar at department of mathematical analysis, Charles University, 22 October 2013.
- Generalized quasidisks and the associated John domains, Analysis Seminar at Department of Mathematics and Statistics, University of Jyvaskyla, 16 October 2013.
- Generalized quasidisks, PDE Seminar at department of mathematics, University of Warsaw, 11 April 2013.

Invited conference/workshop presentations

- The theory of quasiregular mappings in metric spaces, Contributed talk at the 7th International Congress of Chinese Mathematicians, Academy of Mathematics and Systems Science (AMSS) and the Morningside Center of Mathematics (MCM), Beijing, China, August 6-11, 2016.
- The theory of quasiregular mappings in metric measure spaces, International conference on complex analysis and related topics, the 14th Romanian-Finnish Seminar, Bucharest, Romania, June 20-24, 2016.
- On 1-quasiregular mappings between Riemannian manifolds, Meeting for young mathematicians in Finland 2015, Aalto University, Espoo, Finland, 26-28 August 2015.
- The branch set of a quasiregular mapping: recent advances and open problems, Workshop on ``Analysis and Geometry in Metric Spaces", ICMA, Madrid, Spain, 1-5 June 2015.
- Uniform continuity of
quasiconformal mappings onto generalized John domains, Fourth
Finnish-Estonian Mathematics Colloquium and Finnish Mathematical Days
2014, University of Helsinki, Finland, 9-10 January, 2014.

- 26 December 2017 - 19 January 2018, Department of Mathematics, Sun Yat-sen University. Hosts: Profs. Xi-Ping Zhu and Hui-Chun Zhang
- 10 January - 12 January 2018, Department of Mathematics, Southern University of Science and Technology. Hosts: Prof. Liuqing Yang
- 19 January - 25 January 2018, School of Information and Mathematics, YangTze University. Host: Prof. Chang-Lin Xiang

Recent conferences/workshops

- Introductory Workshop on Euler Systems and Special Values of L-functions, EPFL, Lausanne, Switzerland, August 21-25, 2017.
- Geometric analysis and related topics, in honour of Tadeusz Iwaniec's 70th birthday, Będlewo, Poland, July 16-22, 2017
- Mathematics, Physics, and their Interaction. Conference in Honour of Demetrios Christodoulou's 65th Birthday, ETH Zurich, Switzerland, July 10-14, 2017.
- 23rd Rolf Nevanlinna colloquium, ETH Zurich, Switzerland, June 12-16, 2017.
- Advances in geometric analysis, ETH Zurich, Switzerland, June 6-10, 2017.
- Workshop on Journées de Géométrie Hyperbolique, Fribourg, Switzerland, March 23 - 24, 2017.