- Speaker in the XXXémes Journées Arithmétiques, (July 3--7, 2017), University de Caen, France

- Speaker in the Combinatorics and Number Theory Meet (February 19-23, 2017), HRI,
Allahabad, India

- Speaker in the NISER Symposium, Indian National Science Academy
(INSA) Anniversary Meeting (December 28-30, 2016), NISER, Bhubaneswar, India

- Speaker in the International Conference on Number Theory (August 17-21, 2016), KSOM, Calicut, India

- Speaker in the 3rd EU/US Workshop on Automorphic Forms and
Related Topics (July 18-22, 2016), University of Sarajevo, Bosnia and
Herzegovina

- Speaker in the Number Theory Symposium, 31st Annual Conference of
the Ramanujan Math. Soc. (June 18--21, 2016), Tiruchirapalli, India

- Speaker in the 30th Automorphic forms Workshop, (March 7-10, 2016), Wake Forest University, Winston-Salem, USA

- Speaker in the Workshop on Automorphic Forms (February 10-16, 2016), KSOM, Kozhikode, India

- Speaker in the 29th
Automorphic
Forms Workshop (March 2-5, 2015), University
of Michigan, Ann Arbour, USA

- Speaker in the International Conference on Automorphic Forms (February 13-14, 2015), KSOM, Kozhikode, India

- Speaker in the International Conference on Automorphic Forms and Number Theory (August 30- September 3, 2013), KSOM, Kozhikode, India

- Contributed Speaker in the The Legacy of Srinivasa Ramanujan (December 17-22, 2012), University of Delhi, India

- Speaker in the Workshop on Modular Forms (October 3-19, 2012), KSOM, Kozhikode, India

- Speaker in the 26th Automorphic Forms Workshop (April 26-29, 2012), University of British Columbia, Vancouver, Canada

- Speaker in the Bhubaneswar Symposium on Noncommutative Geometry,
Mathematical Physics and Number Theory (January 12-16, 2011), IMA,
Bhubaneswar, India

- Speaker in the Summer
School on Quasimodular Forms, (June 20-26, 2010) Clermont-Ferrand, France

- Visit NISER, Bhubaneswar, December 14-18, 2009

- Workshop on the theory of Jacobi forms and Siegel modular forms, (November 23- December 5, 2009)
Vivekananda College/ IMSc, Chennai, India

- Speaker in the
26émes Journées
Arithmétiques XXVI, (July 6-10, 2009) Saint-Étienne, France

- Speaker in the 23rd Annual Workshop on Automorphic Forms and Related Topics, (March 10-13, 2009) Bucknell University, USA, Slides

- Talk in the K-Theory, Quadratic Forms and Number Theory Seminar (February 4, 2009), School Of Mathematical Sciences, UCD, Dublin, Ireland

- Speaker in the Workshop
in Arithmetic Geometry (September 24-October 5, 2007),
Chennai Mathematical Institute, India

- Speaker in the Jacobi Forms and Applications (May 7-11, 2007), CIRM, Luminy, France Photo 1, Photo 2, Photo 3 . Slides

- Speaker in the International Conference on Number Theory and
Applications (December 27-29, 2006), RKM Vivekananda College, India

- Speaker in the International Conference on Number Theory (December 1-5, 2006), Harish-Chandra Research Institute, Allahabad, India Slides

- XXXémes Journées Arithmétiques (July 3--7, 2017), Universite de Caen, France

- Indefinite Theta functions and Applications in Physics and Geometry (June 6--9, 2017), Hamilton Mathematics Institute, Trinity College Dublin, Ireland

- Combinatorics and Number Theory Meet (February 19-23, 2017), HRI,
Allahabad, India

- School and
Workshop on Modular Forms and Black Holes (January 5--14, 2017),
NISER, Bhubaneswar, India

- Discussion Meeting on Automorphic Forms
(December 21--27, 2016), NISER, Bhubaneswar, India

- Indian National Science Academy
(INSA) Anniversary Meeting (December 28--30, 2016), NISER, Bhubaneswar, India

- International Conference on Number Theory (August 17--21, 2016), KSOM, Calicut, India

- 3rd EU/US Workshop on Automorphic Forms and Related Topics (July 18--22, 2016), University of Sarajevo, Bosnia and Herzegovina

- Workshop on Bianchi Modularity (July 11--15, 0216), University of Luxembourg, Luxembourg

- 31st Annual Conference of the Ramanujan Math. Soc. (June 18--21, 2016), Tiruchirapalli, India

- 30th Automorphic forms Workshop, (March 7-10, 2016), Wake Forest University, Winston-Salem, USA

- Workshop on Automorphic Forms (February 10-16, 2016), KSOM, Kozhikode, India

- 29th Automorphic Forms Workshop (March 2-5, 2015), University of Michigan, Ann Arbour, USA

- International Conference on Automorphic Forms (February 13-14, 2015), KSOM, Kozhikode, India

- Advanced School and Workshop on L-functions and modular forms (September 1-12, 2014), ICTP, Trieste, Italy

- Conference on Analytic Theory of Automorphic Forms (December 9-13, 2013), IMSc, Chennai, India

- International Conference on Automorphic forms and Number Theory,
August 30- September 3, 2013, KSOM, Calicut, India

- 40th Annual Odisha Mathematical Society Conference
(December 29-30, 2012), Sambalpur University, Sambalpur, India

- The Legacy of Srinivasa Ramanujan (December 17-22, 2012), University of Delhi, India

- Workshop on Modular Forms (October 3-19, 2012), Kerala School of Mathematics, Kozhikode, India

- 26th Automorphic Forms Workshop (April 26-29, 2012), University of British Columbia, Vancouver, Canada

- International Colloquium on Automorphic Representations and
L-functions} (Jan 3-12, 2012), TIFR, Mumbai, India

- International meeting on Number Theory, Celebrating the
60th Birthday of Professor R. Balasubramanian (Dec 15-20, 2011), HRI,
Allahabad, India

- School and Conference on Modular Forms and Mock Modular Forms and their applications in Arithmetic, Geometry and Physics (Feb 28-March 18, 2011), ICTP, Italy

- Prospects in q-series and modular forms (July 14-16, 2010) UCD, Dublin, Ireland

- Summer School on Quasimodular Forms (June 20-26, 2010) Clermont-Ferrand, France

- Workshop on the theory of Jacobi forms and Siegel modular forms (November 23- December 5, 2009), Chennai, India

- XXVI Journ\'{e}es Arithm\'{e}tiques (July 6-10, 2009) Saint-\'{E}tienne, France

- Activit\'{e}s Additives et Analytiques} (June 30- July 4, 2009), Lille, France

- Mock theta functions and applications in combinatorics, algebraic geometry, and mathematical physics (May 25-29, 2009) Max Planck Institute for Mathematics, Bonn, Germany

- UCD-Nottingham Number Theory Day (May 2, 2009), University of
Nottingham, England

- 23rd Annual Workshop on Automorphic Forms and Related Topics (March 10-13, 2009), Bucknell University, USA

- International Colloquium on Cycles, Motives and Shimura Varieties (Jan 3-12, 2008), TIFR, Mumbai, India

- Advanced Instructional School in Analytic and Algebraic Number Theory (Dec 3-28, 2007), HRI, Allahabad, India

- Workshop on Arithmetic Geometry (Sept 24-Oct 05, 2007), Chennai Mathematical Institute, Chennai, India

- Jacobi Forms and Applications (May 7-11, 2007), CIRM, Luminy, France

- School and Conference on Analytic Number Theory (April 23-May 04, 2007), ICTP, Italy

- International Conference on Number Theory and Cryptography (Feb 23-27, 2007), HRI, Allahabad

- International Conference on Number Theory and Applications
(Dec 27-29, 2006), RKM Vivekananda College, Chennai, India

- International Conference on Number Theory (Dec 1-5, 2006),
HRI, Allahabad, India

- India-UK Number Theory Conference (Sept 18-23, 2006),
IMSc, Chennai, India

- 33rd Annual Odisha Mathematical Society Conference (Feb
4-5, 2006), Sambalpur University, Sambalpur, India

- International Conference on Number Theory and Mathematical
Physics (December 20-22, 2005), Srinivas Ramanujan Center, Kumbakonam, India

- AMS-INDIA Conference (December 17-20, 2003), IISc, Bangalore, India

- Ramanujan and Tau function, Faculty Development Program on
Computational Mathematical Methods and their application in
enginneering -2016, CVRCE, Bhubaneswar (December 12-18, 2016)

- Group Theory (6 lectures) at SOPM, NISER, Bhubaneswar (June, 2015)

- Groups and Symmetry (6 lectures) at AFS-I, NISER, Bhubaneswar (December 2014)

- Complex Analysis in Number Theory (4 lectures) at TEW on Complex Analysis, Vivekananda College, Burdwan (December 27-31, 2013)

- Symmetry (2 lectures) at Workshop in Excitement in Physics, North Odisha University, Baripada (June 3-7, 2013)

- Representations of integers as sums of squares and modular forms, UGC aided Seminar, F. M. College, Balasore (March 17, 2012)