1. August 28, 2025, Florida International University, Colloquium.
   Talk: "Well-Posedness, Stability, and Bifurcation for Keller-Segel Models on Metric Graphs"

2. November 18-22, 2024, Chapman University, Advances in Operator Theory with Applications to Mathematical Physics, Chapman 2024.
   Talk: "Maslov index in spectral theory: on overview"

3. October 22, 2024, University of Illinois Urbana-Champaign, Harmonic Analysis and Differential Equations Seminar.
   Talk: "Well-Posedness, Stability, and Bifurcation for Keller-Segel Models on Compact Graphs". 

4. July 15-19, 2024 9th European Congress of Mathematics (9th ECM), Sevilla, Spain.
   Talk: "Well-Posedness, Stability, and Bifurcation for Keller-Segel Models on Compact Graphs".

5. June 24-27, 2024, SIAM Conference on Nonlinear Waves and Coherent Structures, Baltimore MD.
   Talk: "Well-Posedness, Stability, and Bifurcation for Keller-Segel Models on Compact Graphs".

6. April 6-7, 2024, Howard University, AMS Sectional meeting.
   Talk: "The Maslov index in spectral theory: an overview".

7. March 7, 2024, Graz University of Technology (Austria), Operator Theory Seminar.
   Talk: "The Maslov index in spectral theory: an overview", 

8. March 6, 2024, University of Vienna, PDE Afternoon Seminar.
   Talk: "Well-Posedness, Stability, and Bifurcation for Keller-Segel Models on Compact Graphs ".

9. October 21-22, 2023, Baylor University, Brazos Analysis Seminar (Plenary talk). 
   Talk: "Maslov index in spectral theory: on overview".

10. July 31-August 4, 2023, University of Helsinki, 34th International Workshop on Operator Theory and Applications (IWOTA 2023).
    Talk: "Maslov index in spectral theory: on overview". 

11.  June 19-21, 2023, Potsdam University (Germany), Seminar on Discrete Spectral Theory.
    Talk: "Maslov index in spectral theory: on overview".

12. June 19-21, 2023, Stockholm University, Marcus Wallenberg Symposium in memory of Sergey Naboko.
    Talk: "Maslov index in spectral theory: on overview", 

13. June 2, 2023, UNC Wilmington, The 13th AIMS Conference on Dynamical Systems, Differential Equations And Applications.
    Talk: "Resolvent Expansions for Self-Adjoint Operators Via Boundary Triplets".

14. April 13, 2023, Georgia Tech, Mathematical Physics Seminar.
    Talk: "Maslov index in spectral theory: on overview".

15. March 28, 2023, Michigan State University, Mathematical Physics and Operator Algebras Seminar.
    Talk: "Maslov index in spectral theory: on overview". 

16. March 20, 2023, Auburn University, DMS Colloquium.
    Talk:"Spectral methods in analysis and mathematical physics".

17. March 18-19, 2023, Georgia Tech, AMS Sectional meeting.
    Talk: "Spectral properties of Schr\"odinger operators with locally $H^{-1}$ potentials". 

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

19.  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", 

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

21. 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" 

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

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

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

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

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

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

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

29. 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"

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

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

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

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

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

35. 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",

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

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

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

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

 Talk: "Localization for Anderson Models on Graphs"

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

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

42. January 2020, King's College London, Department of Mathematics, UK

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

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

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

46. 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"

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

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

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

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

51. 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"

52. 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" 

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

54. 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" 

55. 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" 

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

57. 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"

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

59. April 14--15, 2018, Portland State University, Portland, OR. AMS Spring Western Sectional Meeting.  
    Talk: "A bound for the eigenvalue counting function for higher-order Krein Laplacians on open sets", 

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

61. 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"

62. 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"

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

64. 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"

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

66. 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"

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

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

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

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

71.  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"

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

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

74.  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"

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

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

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

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