Journal Editorship :

• Member of Editorial Board , "Sampling Theory, Signal Processing, and Data Analysis", Springer. (It is a continuation of the journal "Sampling Theory in Signal and Image Processing".)

• Member of Editorial Board "Frontiers in applied Mathematics and Statistics"

Books / International Conference Proceedings (Edited):

1. M. Krishna, R. Radha, S. Thangavelu (Eds.), Wavelets and their applications, Allied Publishers, 2003.

2. Zoran Majkic, Michael Sipser, R. Radha, Daming Wei (Eds.): International Conference on Theoretical and Mathematical Foundations of Computer Science, TMFCS-08, Orlando, Florida, USA, July 7-10, 2008. ISRST 2008, ISBN 978-1-60651-006-3.

3. Zoran Majkic, R.Radha, Sun-Yuan Hsieh (Eds.): InternationalConference on Theoretical and Mathematical Foundations of Computer Science, TMFCS-09, Orlando, Florida, USA, July 13-16, 2009. ISRST 2009, ISBN: 978-1-60651-014-

Organization of Conferences / Continuing Education Programs:

1. Organized an Instructional Workshop and International Conference on Wavelets and their applications (ICWA 2002) in Anna University during Jan 4 - 8, 2002. This meet was funded by NBHM, CSIR, AICTE, ICTP and IMU.

2. Conference Co-chair for the International conference on "Theoretical and Mathematical Foundations of Computer Science (TMFCS-08)", held in Orlando, Florida, USA during July 7-10, 2008.

3. Conference Co-chair and Coordinator for Fourier Analysis and Wavelets Session for the International conference on "Theoretical and Mathematical Foundations of Computer Science (TMFCS-09)", held in Orlando, Florida, USA during July 13-16, 2009.

4. Organized jointly with Prof. Ch. Srinivasa Rao, An AICTE sponsored QIP Short term training programme in "Harmonic Analysis and Partial differential equations" in IIT Madras during January 1-12, 2007

5. Organized an International Symposium on "Harmonic Analysis, Wavelets and Partial differential equations" in IIT Madras on January 8, 2007.

6. Secretary, "National Symposium on Mathematical Methods and Applications - NSMMA 2007" in IIT Madras on December 22, 2007.

7. Member, organizing committee, International Conference and workshop on Fractals and wavelets, Rajagiri College of Engineering and Technology, Cochin, India during , 9-16 November 2013.

8. Member, National advisory committee, International Conference on Fourier analysis and wavelets, Ramanujan Institute for Advanced study in Mathematics, Chennai, India during March 21- 25, 2017.

9. Organized two weeks " Global initiative of Academic Networks (GIAN ) course" along with Prof. S.H. Kulkarni and the Foreign expert Prof. H.G. Feichtinger, IIT Madras, titled "Mathematical Foundations of Signal Analysis (A Fresh Look at Harmonic Analysis)" during January 8-20, 2018 .

10. Organized an international conference (offline) on Analysis, inverse problems and applications in IIT Madras, India during July 18-21, 2022. Funded by IMU, CSIR, Alumni fund, Global engagements, IIT Madras

Visiting Professorship :

• Centre of Mathematics, Technical University Munich, Germany from October 1- 2019 to September 30, 2020 (with sabbatical leave from IIT Madras).

• From October 1 - December 31, 2019. KM Visiting Professorship, funded by Bavarian State Ministry for Science, Research and the Arts, Germany through TUM International Centre. (Host : Prof. Dr. Massimo Fornasier, Chair, Applied Numerical Analysis Group, TUM)

Previous Positions:

1. Post doctoral research : Research Associate with fellowship from Council of Scientific and Industrial Research India, Department of Mathematics, Indian Institute of Technology Madras, India (October 10, 1995 - April 2, 1998) (Supervisor: Prof. S. H. Kulkarni)

2. Lecturer, Department of Mathematics, Anna University, Chennai, India ( April 3,1998 - May 6, 2003)

3. Assistant Professor, Department of Mathematics, Indian Institute of Technology Madras, India (May 7, 2003 - March 23, 2009 )

4. Associate Professor, Department of Mathematics , Indian Institute of Technology Madras, India (March 24, 2009 - July 18, 2013 )

Other Academic Activities:

1. Served as Member of Board of referees, Office of External Affairs, ICTP (2003-2005) (To evaluate applications for funding Conferences in developing countries.)

2. Have experience in refereeing research articles for publication in national and international journals. (For example, Journal of Mathematical Analysis and Applications, Journal of Fourier Analysis and its applications, Journal of Approximation Theory, Integral equations and Operator theory, Journal of Pseudo differential operators and Applications, Proceedings - Mathematical Sciences, Indian Journal of Pure and Applied Mathematics and so on).

3. Have experience in evaluating Ph.D. thesis of various IITs and Universities within India.

4. Have experience in writing reviews for some books, research articles in Zentralblatt Math., Mathematical Reviews.

5. The following are some invited talks in International Conferences/Seminars:

• Special Symposium on Approximation Theory and its Applications, Ramanujan Institute of Advanced study in Mathematics, Chennai, 1993 (Title: On L^p - improving measures)

• International Workshop on Schrodinger Operators, The Institute of Mathematical Sciences, Chennai, 1995 (Title : Multipliers for the Weyl transform)

• International Workshop on Linear Algebra, Numerical Functional Analysis, Wavelet Analysis, Cochin University, 2001 (Title of Talk 1 : Tridiagonal operators and numerical algorithms) (Title of Talk 2 : Wavelets: An unconditional basis of Lp )

• Fourth Congress of the International Society for Analysis, its applications and computation (ISAAC), York University, Toronto, Canada , 2003 (Title: Multipliers for Hermite and Laguerre Sobolev spaces)

• Joint India-AMS Mathematics Meeting, Indian Institute of Science, Bangalore, 2003, (Title : Invertibility of a Tridiagonal Operator)

• International Conference on Recent advances in operator theory and operator algebras, Indian Institute of Science, Bangalore, 2005 (Title : Hardy's inequalities - Recent Developments)

• International conference on Functional and Harmonic Analysis, Indian Institute of Technology Kanpur, 2006 (Title : Hermite semigroup and holomorphic Sobolev spaces)

• International Conference on Artificial Intelligence and Pattern recognition, Orlando, Florida, USA, 2007 (Title : Image reconstruction in shift invariant spaces)

• International conference on Analysis and applications, Indian Institute of Science, Bangalore, 2009 (Title : Non uniform sampling in shift invariant spaces)

• International Conference on Fourier analysis and wavelets, Ramanujan Institute for Advanced study in Mathematics, Chennai, India, 2017 (Four Thematic lectures on Dual wavelet frames)

• 15^th Discussion Meeting - An international Conference in Harmonic Analysis, Indian Institute of Science, Bangalore, India, 2017 (Title : Frames and shift invariant spaces on the Heisenberg group)

• Annual Conference of Indian Mathematical Society - An international Coference - A symposium on Function spaces and inequlaities, Tirupati, India, 2017 (Title : Frames and bases of systems of translates - Recent developments)

• International Conference on computing Sciences, Loyola College, Chennai, India, 2018 (Title : Sampling in shift invariant spaces - Some recent developments)

• Oberseminar, Technical University Munich, Germany, 17.10.2019 (Title : Multipliers for the Fourier transform)

• Mathematics weekly Seminar, Catholic University of Eichstaett- Ingolstadt, Germany, 16.12.2019 (Title : Stable set of sampling in shift invariant space with multigenerators)

• International conference on Mathematical analysis and computations, Shiv Nadar University, Chennai, India, 2022 (Title : Invertibility of infinite band matrices and solutions of their operator equations)

6. Serving as a doctoral committee member for Ph.D. Scholars within and outside departments of IIT Madras and other Universities within Chennai.

7. Visited Catholic University of Eichstaett-Ingolstadt on December 16, 2019 (Host : Prof. Goetz Pfander) and University of Vienna on August 23 -24, 2020 (Host : Prof. H.G. Feichtinger) during the stay in Munich 2019-2020.

Other Responsibilities and Assignments:

• Have experience as a member of Selection Committee in Faculty recruitment of some Centrally funded Institutes such as IIT, ISI Kolkata, NISER, IISER, IIIT D&M.

• Served as a Hostel Warden (Sabarmati Girls Hostel) from June 2017 to August 2019.

• Have experience as a Member of Guiding and Counseling Unit at Institute level

• Served as a Member in Disciplinary and welfare committee, Member of reconsideration and formation of new TCF format at Institute level

• Have experience as a Member of Board of Studies, University of Madras

• Have experience as a Member of Board of Industrial Consultancy and Sponsored Research at IIT Madras

• Have experience as a Member of Committee for reconsideration of TCF

• Have experience as a Member of Board of Placement and Training , IIT Madras

• Have experience in Question Paper preparation team for National level Entrance Examinations such as JEE, JAM, GATE

• Have experience in participating as Anna University Representative, IIT Representative in conducting Entrance Examinations at State level and National Level

• Have experience in serving as a Coordinator of several common courses

• Have experience as a member, Chairman, Grievance committee at the department level and a Member at Office of Hostel Administration

• Continuously engaged in departmental activities such as Faculty advisor, Class Committee Chairman, Seminar Coordinator, Member of Selection Committee for Ph.D, Member of Curriculum revision Committee, Member of formation of Integrated M.Sc. Committee, Coordinator for Research Methodology, Coordinator for Projects and so on.