Global Heart, Inc.
a non-profit organization

NEW! Listen To Dolphins

Dolphin Code CD
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Music written by
the dolphins

The Project is
spearheaded by Global Heart, Inc.,
a 501(c)3 non-profit organization
based in Miami, Florida,
founded by Donna & Jack Kassewitz.

Our work has appeared on:

Research News

We are continuing to investigate dolphins’ low-frequency targeting clicks. We have established that dolphins, during target approach, indeed emit frequencies well below their long distance sonar band. We are now working on multiple simultaneous hydrophone recording during target approach in order to capture and isolate outgoing click waveforms and target echoes. Coordinating with simultaneous video, we can measure 3D angle and distance of dolphin to target on a per-click basis. This data may be the key to understanding how the dolphin sees the target with sound.

Research Breakthroughs

A Phenomenon Discovered While Imaging Dolphin Echolocation Sounds

August 2016 - Peer reviewed scientific paper by Jack Kassewitz and the Speak Dolphin team is published in “Journal of Marine Science: Research & Development”

First "What-the- dolphin-saw" Image of a Man:

Researchers in the USA and UK and have made a significant breakthrough in imaging a submerged man from the echolocation beam transmitted by a dolphin.

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Researchers at Create the First 3D Print of Dolphin Echolocation

The prints are made with a unique multi-step process that records and isolates dolphin echolocation sounds on specific objects, creates two-dimensional images from those sounds, and uses photo analysis to extract three-dimensional data from the images.

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Book Now Available

Amazon Store


This fascinating story about Jack Kassewitz's scientific breakthroughs in dolphin communication and his friendships with orangutans offers much hope for humanity's evolving role as stewards for all animals.

Our New Book


Is now available through or at our CreateSpace Store. Using our CreateSpace Store will better help our funding for future research.

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