Ziad Kreidy, French-Lebanese musician, musicologist, pianist, and fortepianist.  
Professor of Music Culture (analysis, research, composition) at Conservatoire à Rayonnement Départemental of Ville d’Avray.  
Author of Takemitsu. À l’écoute de l’inaudible, L’Harmattan, awarded a "Coup de Cœur Musique Contemporaine 2010" by the Académie Charles Cros, Les avatars du piano, Beauchesne, La facture du piano et ses métamorphoses and  Clefs pour le piano. Keys to the piano, Aedam Musicae.

His recordings are made live on rare instruments.

Michael JohnsonFacts & Arts 
(...) Keys to the Piano, conceived and edited by Lebanese-born Parisian Ziad Kreidy, a pianist and ranking academic. It is a fascinating collection of 21 essays and papers from a disparate collection of piano builders, composers and a few visionaries from ten countries.

Guillaume Lagrée
Le jars jaze jazz
Clefs pour le piano / Keys to the piano will open doors that you didn't know existed. Thanks to Ziad Kreidy for this encyclopaedic work in the service of music in general and the piano in particular. 
My personal 1/8th comma temperament for the romantic repertoire
Agnès Simon - ResMusica
Guillaume Lagrée - Le jars jaze jazz  
Amer Didi - Intersections: Canadian Journal of Music; Toronto Vol. 37, N° 1
Written in an attractive style, the book is aimed at the general public as well as keyboard music lovers, pianists, musicologists, and piano builders. Based on a long pianistic career and an abysmal knowledge of the piano and the aesthetics of European cultivated music, this short book contributes to the advancement of knowledge by questioning ideas that have sometimes become axiomatic in piano aesthetics and construction. 
The article  L'image chez Tôru Takemitsu 
Complutense University Press - Madrid

It is when he speaks of technique, when he describes with precision the metamorphosis of this "impossible to find" instrument that Kreidy is most original and most evocative, or when he highlights, with musical examples to prove it, the difficulty of concretizing on a modern piano some of Beethoven or Chopin’s instructions.
François Lafon - www.musikzen.fr 

Kreidy broaches his subject from an appropriate but hitherto under or unexplored point of view. This brief and seriously argued volume is the result of research conducted for more than ten years with a synthetic approach and a personal practice of the piano at each stage of its metamorphosis. It should advantageously draw the attention of pianists in particular and musicians and music lovers in general.  
Christine Labroche - www.concertonet.com 

Short and fascinating (…) this is a stimulating, disturbing, and instructive book. “The role of the intellectual is to sow doubts, not to reap certainties” (Norberto Bobbio). That is what Ziad Kreidy does superbly.
Guillaume Lagrée - www.lejarsjasejazz.over-blog.com 

Ziad Kreidy is interested in discovering composers through their pianos; something quite rare. This book, Les avatars du piano, is a ferment of ideas, it brainstorms a tremendous amount of ideas, and it merges al lot of ideas. It does not put forward the truth, the only one, it’s a book that makes us think.  
Ivanka Stoïanova - Musicologist

Musicologist and pianist at once, Ziad Kreidy conducts research in multiple forms. I was recently very impressed by his interest in epoch instruments. 
Christian Goubault - Musicologist

Under the penmanship of the eminent Lebanese-French pianist and musicologist Ziad Kreidy, this is a must-read!
Francis Cousté - L’Éducation Musicale 

This short book is obviously worth reading by any piano amateur who listens and/or plays that instrument. 
Agnès Jourdain - www.pianobleu.com 

Between the power of today's piano and the lost nuances of pianos of the past, where would the heart of a Mozart or a Chopin go? Unanswered question. And yet, Ziad Kreidy wonders about the evolution of the piano. How was it so different in 1830, for example, from today? How does the piano influence the composer's writing? In short, he invites us on a journey through the ages of the piano.
La lettre du musicien

Les avatars du piano, by Ziad Kreidy, is "a journey through the ages of the piano, through its qualities gained or lost, through its metamorphoses". Ancient piano, modern piano, same fight? (...) A short book that raises intelligent queries and is aimed at anyone who loves the keyboard.. 
Jean Lacroix - La revue Générale - n° 08 - 09/2012

In this historical and documented study, the author provides some answers and gives his opinion on these debates that are at the heart of the instrument. "No two pianos are alike," of course, but what have these three hundred years of evolution led to? Pierre Boulez, quoted in the book, answers: "It is a question of developing this monument, this institution, this massive and spectacular object into incredible sounds. Pianoforte, harpsichord, Érard, Pleyel, single or double escapement, etc., all nuances that hide the "hegemonic power of the modern piano" and that the reader, scholar or not, but necessarily a piano lover, will discover with delight.
Clément Kolopp - L'Orient le Jour

Schumann Waldszenen Op. 82 in uneqeual temperament - upright Érard from 1852
Interview | Ziad Kreidy : Les avatars du piano     AutreRadioAutreCulture · june 10, 2012    
Chopin | Prelude op. 28 No 15
Pianoforte Erard grand from 1838

Sound recording: Ludovic de Nayer

Documentary | Les avatars du piano