1. October 15-16, 2022, University of Tennessee at Chattanooga, AMS Sectional meeting.
   Talk: "Spectral properties of Schr\"odinger operators with locally $H^{-1}$ potentials"

2.  September 26-30, 2022, Carl von Ossietzky University of Oldenburg (Germany), Asymptotic analysis and spectral theory.
   Talk: "Asymptotic perturbation theory for extensions of symmetric operators", 

3. September 9, 2022, Auburn University,  Applied and Computational Math Seminar,
   Talk: "Spectral properties of Schr\"odinger operators with locally $H^{-1}$ potentials"

4. June 6-10, 2022, Stony Brook University, Simons Center for Geometry and Physics, Workshop on Ergodic operators and quantum graphs
   Talk: "Two classes of ergodic operators on metric graphs" 

5.  April 15, 2022, Texas State University, San Marcos, Differential equations and applied mathematics seminar  
   Talk: "Schrodinger operators with singular slowly decaying potentials" 

6. April 7, 2022, University of Tennessee, Knoxville, PDE Seminar
   Talk: "Anderson Localization for Disordered Quantum Graphs" 

7. March 30- April 1, 2022, University of Georgia, Athens, The Twelfth IMACS International Conference  
   Talk: "Two classes of dynamically defined quantum graphs"

8. March 2, 2022, Baylor University, Analysis Seminar.
   Talk: "Maslov index and Spectral Flow", 

9. February 14-18, 2022, Karlsruhe Institute of Technology, Germany,  Conference on Mathematics of Wave Phenomena.
             Talk: "Asymptotic perturbation theory for extensions of symmetric operators", 

10.  December 8-10, 2021, Stockholm University,  Sweden, QGraph 2021: Quantum graphs in Mathematics, Physics and Applications.
    Talk: "Two classes of dynamically defined quantum graphs"

11. November 7, 2021, Troy University, 
    Talk: "Localization for Anderson Models on Graphs"

12. August 9-13, 2021, Chapman University, Orange CA, International Workshop on Operator Theory and its Applications
    Talk: "A Bound for the Eigenvalue Counting Function For Krein--von Neumann and Friedrichs Extensions"

13. June 4, 2021, Michigan State University, Great Lakes Mathematical Physics Meeting,
    Talk: "Asymptotic perturbation theory for extensions of symmetric operators" 

14. May 1-2, 2021, Spring Western Sectional Meeting (formerly at San Francisco State University),
    Talk: "Limits of quantum graph operators with shrinking edges" 

15. April 9, 2021, Texas State University, San Marcos, Differential Equations and Applied Mathematics Seminar
    Talk: "Asymptotic perturbation theory for extensions of symmetric operators" 

16. March 31, 2021, Baylor University, Analysis Seminar,  
    Talk: "Asymptotic perturbation theory for extensions of symmetric operators" 

17. February 19, 2021, The University of Alabama, Analysis Seminar,
    Talk: "Localization for Anderson Models on Graphs", 

18. December 8-9, 2020, Stockholm University,  Sweden, QGraph 2020: Quantum graphs in Mathematics, Physics and Applications VIII.  

   Talk: "Limits of quantum graph operators with shrinking edges",

19. October 30, 2020, Rice University, Spectral Theory Seminar,
    Talk: "Hadamard-type formulas and resolvent expansions",

20. October 16-18, 2020, Texas A&M University, 3rd SIAM TX-LA Section,
    Talk: "Localization for Anderson Models on Graphs"

21. September 25, October 2, October 9, 2020, Auburn University,  Applied and Computational Math Seminar,
    Talks: "Localization for Anderson Models on Graphs",

22. September  22, 2020, University of Minnesota, Dynamical Systems Seminar, 

 Talk: "Localization for Anderson Models on Graphs"

23. January 2020, Colloquium, Binghamton University, Department of Mathematical Sciences
    Talk: "Anderson localization for disordered quantum graphs "

24. January 2020, Colloquium, University of Massachusetts Lowell, Department of Mathematical Sciences,
    Talk: "Anderson localization for disordered quantum graphs "

25. January 2020, Job Talk, King's College London, Department of Mathematics, UK

26. January 2020, Colloquium, Auburn University, Department of Mathematics and Statistics
    Talk: "Anderson localization for disordered quantum graphs "

27. January 2020, Colloquium, The University of Texas at Dallas, Department of Mathematical Sciences
    Talk: "Anderson localization for disordered quantum graphs "

28. November 9-10, 2019, University of California, Riverside, AMS Fall Western Sectional Meeting.
            Talk: "Hadamard-type formulas and resolvent expansions"

29. November 1-3, 2019,  Southern Methodist University, SIAM Texas-Louisiana Section 2nd Annual Meeting
            Talk: "The Maslov Index and the Spectra of Second Order Elliptic Operators"

30. October 28, 2019, Rice University, Undergraduate Colloquium, Department of Mathematics,
            Talk: "Anderson localization for disordered quantum graphs "

31. September 15-20, 2019, BIRS, Workshop on Random Matrix Products and Anderson Localization, Banff, Canada
    Talk: "Localization for Anderson Models on Tree Graphs"

32. September 13, 2019, Texas A&M University, Mathematical Physics and Harmonic Analysis Seminar.
    Talk: "Hadamard-type formulas and resolvent expansions", September 13, 2019

33. September 5-8, 2019, University of Missouri, Analysis in Missouri: a Midwestern symposium, Columbia, MO
    Talk: "Localization for Anderson Models on Tree Graphs"

34. August 4-9, 2019, Lake Como School of Advanced Studies, Quantum Graphs and Quantum Random Walks in Mathematics, Computer Science and Physics, Italy
            Talk: "Localization for Anderson Models on Tree Graphs"

35. June 24--27, 2019, University of Hagen, Germany, On mathematical aspects of interacting systems in low dimension,
    Talk: "Localization for Anderson Models on Tree Graphs" 

36. April 17--19, 2019, University of Georgia, Athens, 11th IMACS Conference on Nonlinear Waves,
            Talk: "Localization for Anderson Models on Tree Graphs" 

37. March 8, 2019, Texas A&M University. Joint Mathematical Physics, Harmonic Analysis and Groups and Dynamics Seminar,
            Talk: "Localization for Anderson Models on Tree Graphs" 

38. February 25--March 1, 2019, Graz University of Technology, Austria, Differential Operators on Graphs and Waveguides, Austria
            Talk: "Localization for Anderson Models on Tree Graphs" 

39. November 8, 2018, University of California, Santa Cruz, Analysis and Geometry seminar,
            Talk: "The Maslov Index and the Spectra of Second Order Elliptic Operators"

40. July 23–27, 2018, Karlsruhe Institute of Technology, Germany, Conference on Mathematics of Wave Phenomena,
            Talk: "The Maslov Index and the Spectra of Second Order Elliptic Operators"

41. June 11-14 2018,  SIAM Conference, Anaheim, CA,
            Talk: "On Limits of Quantum Graph Operators with Shrinking Edges "

42. March 23, 2018, University of Houston, PDE Seminar,
            Talk: "The Maslov Index and the Spectra of Second Order Elliptic Operators"

43. March 5-9, 2018, University of Arizona, Tucson, Arizona School of Analysis and Mathematical Physics
            Talk: "The Maslov Index and the Spectra of Second Order Elliptic Operators"

44. February 18-19, 2018, University of California, Irvine, 36th Western States meeting of Mathematical Physics,
            Talk: "The Maslov Index and the Spectra of Second Order Elliptic Operators"

45. SIAM Conference on Analysis of Partial Differential Equations, Baltimore MD
            Talk:"The Maslov Index and the Spectra of Second Order Elliptic Operators"

46. Universiyt of Texas, Austin,Texas Analysis and Mathematical Physics Symposium 2017, Austin, TX
            Talk:"The Maslov Index and the Spectra of Second Order Elliptic Operators"

47. Rice University, Houston TX, Geometry-Analysis Seminar
            Talk:"The Maslov Index and the Spectra of Second Order Elliptic Operators"

48. Texas A&M University, Mathematical Physics and Harmonic Analysis Seminar, College Station, TX.
            Talk:"The Maslov Index and the Spectra of Second Order Elliptic Operators"

49. SIAM Conference on Applications of Dynamical Systems, Snowbird, UT, USA
    Talk:"The Maslov Index and the Spectra of Second Order Elliptic Operators"    

50. Baylor University, Waco TX, Analysis Seminar,
      Talk :"The Maslov Index and the Spectra of Second Order Elliptic Operators" 

51. University of Georgia, Athens GA, The Tenth IMACS Conference on Nonlinear Waves,     
            Talk :"The Maslov Index and the Spectra of Second Order Elliptic Operators"

52. SIAM Conference on Nonlinear Waves and Coherent Structures, Philadelphia, PA, USA
    Talk: "Counting spectrum via the  Maslov index for Schrödinger operators"

53.  Texas A&M University, College Station TX, Mathematical Physics and Harmonic Analysis Seminar,
    Talk: "A Bound for the Eigenvalue Counting Function for Higher-Order Krein Laplacians on Open Sets"

54. University Kansas, Lawrence KS, Computational & Applied Mathematics Seminar
    Talk:"Counting spectrum via the  Maslov index for Schrödinger operators"

55.  University Kansas, Lawrence KS, KUMU PDE, Dynamical Systems and Applications,
    Talk:"The Morse and Maslov Indices for Schrödinger Operators"

56.  Missouri University of Science and Technology, Rolla MO, The 1st Annual Meeting of SIAM Central States Section,
    Talk:"The Morse and Maslov Indices for Schrödinger Operators"

57.  University of Missouri, Columbia MO, Differential Equations Seminar,
    Talk:"The Morse and Maslov Indices for Schrödinger Operators"

58.  University of Memphis, The 34th Southeastern-Atlantic Regional Conference on Differential Equations,
    Talk:"The Morse and Maslov Indices for Periodic Schrödinger Operators"

59.  University of Missouri, Columbia MO, Differential Equations Seminar,
    Talk:"A Bound for the Eigenvalue Counting Function for Higher-Order Krein Laplacians on Open Sets"

60.  Heinrich-Fabri Institut, Blaubeuren, Germany, Operator Semigroups and Dispersive Equations,
    Talk:"A Spectral Mapping Theorem for Nonlinear Schrodinger Equation"

Conferences/Workshops attended:

1. July 1-5, 2019, Institut Henri Poincaré, Stability of Nonlinear Waves: Analysis and Computation, Paris, France

2. June 17-24, 2018, BIRS FRG Workshop, Stability Indices for Nonlinear Waves and Patterns in Many Space Dimensions, Banff, Canada

3. Waves, Spectral Theory and Applications – Part 2, University of North Carolina, Chapel Hill, NC.

4. Conference on Methods of Modern Mathematical Physics, The Fields Institute, Toronto, Canada

5. Frontiers in Mathematical Physics. In honor of Barry Simon's 70th birthday, University of Montreal, Canada

6. Applications of the Maslov index to multidimensional stability problems, AIM SQuaRE, San Jose, CA, USA

7.  Geometric and Computational Spectral Theory, University of Montreal, Canada

8. KUMUNU Conference on PDE, Dynamical Systems and Applications 2017, Lincoln, NE, USA  

9. Stability of Solitary waves, Pisa, Italy

10. University of North Carolina, Chapel Hill, research visit by invitation of Prof. C. K. R. T. Jones