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  • University of California, Los Angeles, 1985

  • Annual Canadian Conference on Operator Theory/ Operator Algebras, July 1986

  • University of California, SanDiego, 1989

  • University of Georgia, Athens, 1989

  • Mittag - Leffler Institute, Stockholm, 1991

  • Summer school on Multi-variate Operator Theory, Seattle, 1993,

  • Texas A&M University, College Station, 1993

  • International Conferenece in honor of B. Sz.-Nagy, Szeged, 1993

  • B. Sz.-Nagy Memorial Conference, Szeged, 1999

  • SUMRIFAS, Texas A&M University, College Station, 1999

  • Graduate Centre, CUNY, New York, 1999

  • University of Joseph Fourier, Grenoble, May 2001

  • University of Pierre and Marie Curie, Paris, June 2002

  • CIRM, Luminy, June 2003

  • Texas A&M University, November 2003

  • Ben Gurien University, June 2005

  • Romanian Institute of Mathematics and West University in Timisoara,
    Plenary talk, July 2006

  • Ben Gurien University, July 2007

  • Texas A & M University, Oct 2007

  • Operator theory with Application to Geometry and Topology:
    In Honor of Ronald Douglas' Seventieth Birth-day, June 2-6, 2008, China

  • First Indo-Brazilian Symposium on Mathematics, IMPA, July 28 - August 1, 2008

  • A sheaf theoretic model for analytic Hilbert modules , Hilbert Modules and Complex Geometry, Institute for Mathematics, Oberwolfach, April 5-9, 2009

  • Chalmers University, Oct 2010

  • A sheaf model for semi-Fredholm Hilbert modules I, Analysis Seminar, The University of Newcastle upon Tyne, October 28, 2010.

  • A sheaf model for semi-Fredholm Hilbert modules II, Analysis Seminar, The University of Newcastle upon Tyne, November 4, 2010.

  • Yorkshire Functional Analysis Group seminar
    Unnivesity of Leeds, October, 2010

  • Reproducing kernel for a class of weighted Bergman spaces on the symmetrized polydisc, AMS Sectional Meeting Cornell University, September 10-11, 2011

  • Quantum Probability, Noncommutative Geometry, Quantum Information
    ICMS, Edinburgh, 16th - 18th January 2012

  • Pure Mathematics Seminars, Lancaster University, January 2012

  • The complex analysis seminar, University of Vienna, April 2012

  • Chalmers University, Jun 2012

  • Complex Geometry and Operator Theory at IWOTA
    University of New South Wales, July 16-20, 2012

  • Classification of homogeneous operators in the Cowen-Douglas class, Indo-Spanish Conference on Geometry and Analysis, ICMAT, 10-14 September 2012 and
  • University of Marburg, June 12, 2012.

  • Flag structure for operators in the Cowen-Douglas class, Functional Analysis Seminar, University of Saarbrucken, February 12, 2014.

  • Flag structure for operators in the Cowen-Douglas class , Hilbert modules and Complex geometry, Institute for Mathematics, Oberwolfach, April 20-26, 2014.

  • Contractive and completely contractive homomorphisms over function algebras, Functional Analysis Seminar, University of Leipzig, July. 21, 2015.

  • Homogeneous Hermitian holomorphic vector bundles and the Cowen-Douglas class, Hilbert Modules in Analytic Function Spaces, Tsinghua Sanya International Mathematics Forum (TSIMF), May 26, 2017.

  • Homogeneous bundles and operators in the Cowen-Douglas class, International Workshop on Operator Theory and its Applications (IWOTA), East China Normal University, Shanghai, July 26, 2018.

  • The Berger-Shaw theorem for a pair of commuting operators, Hilbert Modules in Analytic Function Spaces, Tsinghua Sanya International Mathematics Forum (TSIMF), Dec 30, 2019.



  • Institute for Mathematical Sciences, Chennai, 1987

  • International Workshop on invariant subspaces, University of Delhi, 1987

  • Mehta Research Institute, Allahabad, 1987

  • Mehta Research Institute, Allahabad, 1989

  • Discussion meeting on Harmonic Analysis, IIT - Kanpur, 1990

  • Discussion meeting on Harmonic Analysis, IISc., Bangalore, 1992

  • Annual meeting, Indian Mathematical Soc., University of Poona, Pune, 1994

  • Central University, Hyderabad, 1996

  • Discussion meeting on Harmonic Analysis, ISI - Calcutta, 1998

  • Ramanujan Mathematical Society, Thirunelvelli, 1998

  • Workshop on Dynamical Systems and Ergodic Theory, Mumbai, 1999

  • Millenium Lectures on Functional Analysis, IIT-Gwauhati, 1999

  • Discussion meeting on Harmonic Analysis, IIT - Kanpur, 2000

  • International Workshop on functional Analysis,
    Cochin University of Science & Technology, August 2001

  • Annual Meeting of the Jammu Mathematical Society, February 2002

  • International Conference on Harmonic Analysis and Quantum groups,
    Cochin University of Science & Technology, January 2005

  • Indian Institute of Science, February 2006

  • Institute of Physics, Bhubaneswar, September 2006

  • Homogeneous operators on Hilbert spaces of holomorphic functions, Colloquium, Indian Institute of Science, Mar 2006.

  • Institute for Mathematical Sciences (IMSc), Chennai, August 2007

  • Discussion Meeting on non-commutative geometry and operator algebras, Feb 2008

  • Ramanujan Institute for Advanced Study in Mathematics, Mar 2008

  • Ramanujan Mathematical Society, Plenary talk
    Annual Meeting, IIT - Kanpur, May 2008.

  • Kerala University, Dec 2008

  • IISER Pune, October 2009

  • Kerala School of Mathematics, Calicut, Feb 2010

  • Conference on Mathematical Foundations of Quantum Mechanics
    IISER Kolkata, December 2010

  • Counting, INSPIRE, KIIT Bhubaneswar, January 14 and July 22, 2011.

  • Differentiation (?)!, Institute Colloquium (IISc), April 15, 2011.

  • Computing $\pi$, KVPY-11, IISER Trivandrum, June 21, 2011, 2011.

  • A tale of two hotels, INSPIRE, HNB Garhwal University, Srinagar Garhwal, November 12, 2011.

  • IIT, Chennai, Dec 22, 2011

  • Curvature Inequalities, SunderFest, IMSc, April 4 - Apr 6, 2012.

  • Delhi University, August 2012

  • Almora Mathematical Surveys, Almora, Sep 2012

  • Ramanujan Mathematical Society, Plenary talk
    Annual Meeting, New Delhi, Oct 2012

  • Recent advances in Operator Theory and Operator Algebras
    Indian Statistical Institute, Bangalore, Jan 2013

  • Quasi-invariant kernels, First Department Day, IISER - Kolkata, March 14 - 15, and Colloquium, IISER Pune, Sep 13, 2013.

  • Zeroes of polynomials, Science Academies Lecture workshop, Jain University, Bangalore, December 28, 2013.

  • The Bergman kernel and the Bergman metric, Recent Advances in Operator Theory and Operator Algebras, Indian Statistical Institute, Bangalore, December 15, 2014.

  • Homogeneous Vector Bundles and intertwining Operators for Symmetric Domains, Geometry of Banach Spaces and Operator Theory, March 27, 2015.

  • Curvature Inequalities for operators in the Cowen-Douglas class, Annual Conference of the RMS, IISER Mohalli, May 15, 2015.

  • Ethics in Science – the dos and don'ts and a short video clip from Nature: Reproducibility Crisis, SRFP 2016 - Special Lecture (Indian Academy of Sciences), June 17, 2016.

  • The bound of Varopolous and embedding of $\ell^1(n)$, Calcutta Mathematical Society, Dec 17 - 19, 2015 and Ramakrishna Mission Vidyamandir, September 27, 2016.

  • Role of the curvature in Operator theory, IIT Kanpur, December 14, 2016.

  • Grothendieck Inequality, R.K. Rubugunday Distinguished Lecture, Chennai Mathematical Institute (CMI), January 18, 2017.

  • The Polynomial Game and the Cantor Set, Pi Day, IISER Pune, March 11, 2017.

  • Fundamental Theorem of Calculus, IIT Dharwad, April 12, 2018.

  • Homogeneous Hermitian holomorphic vector bundles and the Cowen- Douglas class over bounded symmetric domains , Somesh Chandra Bagchi Memorial Lecture, Sep 11, 2018

  • Grothendieck Inequality,   Colloquium, ICTS, Bangalore, April 22, 2019.

  • The Bergman Kernel, Research Scholars Meet, Jammu University, August 22, 2019.

  • The Arveson-Douglas conjecture for semi-submodules, Conference on Functional Analysis @ IIT Bomby 2019, October 19, 2019.

  • A product formula for homogeneous characteristic functions, Plenary Lecture, Indian Mathematical Society, IIT Kharagpur, November 22, 2019.

  • Advanced Functional Analysis and its Applications, IIT Hyderabad, November 25 - 29, 2019.

  • Berger-Shaw Theorem,    KBSFest, ISI Bangalore, December 13, 2019.

  • 1+2+3 + ... = - 1/12, Gujarat University, December 22, 2019.

  • Real stability of polynomials, IIT Kanpur, December 25, 2019.

  • Sushil Kumar Banerji Memorial lecture, Indian Statistical Institute, Kolkata, February 28, 2020.

  • Which homogeneous operators are subnormal,     , Punjab University, Feb 14; IISER Bhopal Math Symposium, Mar 6, and WOTOA, Aug 26, 2020.

  • Mathematics of everything, Pre-Event of IISF 2020, CSIR-CSMCRI, Bhavnagar, Dec 18, 2020.



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