Top players: top jobs
The fact that many leading professional players use PHC mouthpieces proves the success of the design:
| Elspeth Dutch | Principal Horn, City of Birmingham Symphony Orchestra, UK | |
| Frank Lloyd | Virtuoso horn player and Professor of Horn at the Folkwang Academy in Essen, Germany | |
| John Ryan | Principal Horn, London Philharmonic Orchestra | |
| Jeffrey Bryant | Horn Professor, Guildhall School of Music, London | |
| Richard Bissill | Principal Horn, Orchestra of the Royal Opera House, Covent Garden, London | |
| Simon Rayner | Principal Horn, Orchestra of the Royal Opera House, Covent Garden, London | |
| Timothy Jones | Principal Horn, London Symphony Orchestra | |
| Angela Barnes | 2nd Horn, London Symphony Orchestra | |
| Martin Owen | Principal Horn, BBC Symphony Orchestra, London | |
| Laurence Rogers | Principal Horn, Hallé Orchestra, UK | |
| Tim Thorpe | Principal Horn, BBC National Orchestra of Wales | |
| Kathryn Saunders | 2nd Horn, Royal Philharmonic Orchestra, London | |
| Nigel Black | Principal Horn, Philharmonia Orchestra and Head of Brass, Royal College of Music, London | |
| Anthony Halstead | Soloist & former Principal Horn, The Academy of Ancient Music | |
| Hugh Seenan | Session player and Horn Professor, Guildhall School of Music, London | |
| Laurence Davies | Principal Horn, Royal Philharmonic Orchestra, London | |
| Christopher Parkes | Principal Horn, Swedish Radio Symphony Orchestra | |
| John Thurgood | Principal Horn, English National Opera and English Chamber Orchestra | |
| Reinhard Zmoelnig | 2nd Horn, Volksoper Vienna | |
| David Posner | Principal horn, Orchestre Symphonique de Quebec | |
| Roger Montgomery | Principal Horn Orchestre Révolutionaire et Romantique and 3rd Horn, Orchestra of the Royal Opera House, Covent Garden, London | |
| Andrew Clark | Principal Horn, Orchestra of the Age of Enlightenment and Professor of Natural Horn, Royal Academy of Music, London | |
| Jonathan Lipton | 4th Horn, London Symphony Orchestra | |
| Robert Ashworth | Principal Horn, Opera North, Leeds, UK |
Quite apart from the endorsement of the above, amongst many other players, Anthony Halstead's position as a leading exponent of the natural horn has given him an insight into a very convincing historical precedent for the use of larger mouthpieces. In 1810 Domnich recommended an internal cup diameter of 18mm for Ist horn players, together with one of 20mm for 2nd horn players, and as early as 1800 Duvernoy had recommended a cup diameter of 19mm for the 2nd horn.