Jon Duschinsky (pictured right), speaker, social entrepreneur and consultant, tops this year's list of best fundraising consultants.

Michael Chatman, one of the most listened-to voices in philanthropy and social innovation with more than 245,000 followers on Twitter, recently asked 250 leaders of charitable organizations, to rank the most effective fundraising consultants.

"Jon Duschinsky is one of the world's most innovative fundraising consultants. His work in philanthropy and social innovation is invaluable. It is rigorously researched, practical, clear, well written, well presented and always relevant."

1. Jon Duschinsky - www.theconversationfarm.co

2. Sandy Macnab - www.alexandermacnab.com

3. Leslie Biggins Mollsen - www.acb-inc.com

4. Joshua Birkholz - www.bwf.com

5. Robert Kissane - www.ccsfundraising.com

6. Corrine Servily - www.faircomny.com

7. Robert Greenwood - www.thegreenwoodcompany.com

8. Kathryn Banakis - www.donorscape.com

9. John Cash, PhD - www.martsandlundy.com

10. Tracy Ritson - www.miratelinc.com

11. Deborah Montgomery - www.grantwriters.net.

12. Norman Gildin - www.strategicfundraisinggroup.com

13. Spencer Perlman - www.wscdc.com

14. David King - www.fundraisingcounsel.com

15. Penelope Burk - www.cygresearch.com

16. Adrian Sargeant - www.studyfundraising.com

17. Howard Stevenson - www.gettingtogiving-fundraising.com

18. Jerold Panas - www.jeroldpanas.com

19. Tom Ahern - www.aherncomm.com

20. Diane Remin - www.majordonors.com

21. Nell Edgington - www.socialvelocity.net

22. Gail Perry - www.gailperry.com

23. Leslie Crutchfield - www.fsg.org

24. Simone Joyaux - www.simonejoyaux.com

25. Gordon Jay Frost - www.fundraisinginfo.com

26. Larry C. Johnson, CFRE - www.megraceassociates.com

27. Kris Putnam-Walkerly - www.putnamcic.com

28. Peter Drury - www.dzostrategists.com

29. Penelope Cagney - www.thecagneycompany.com

30. Lori Jacobwith - www.lorijacobwith.com

31. Tony Martignetti - www.mpgadv.com

32. Tammy Zonker - www.tammyzonker.com

33. Ted Hart - www.P2Fundraising.org

34. Tania Little - www.ideatephilanthropy.com

35. Pamela Grow - www.pamelagrow.com

36. Michael Rosen - www.mlinnovations.com

37. Amy Eisenstein - www.tripointfundraising.com

38. Marc Pitman - www.fundraisingcoach.com

39. Andrea Kihlstedt - www.askingmatters.com

40. Val Porter - http://atlantablog.foundationcenter.org/