| Business | Phone |
| F F & A 138 5th Ave # 300, New York 10011 | (212) 691-1110 |
| Forensic Research 116 Fulton St, New York 10038 | (212) 233-3822 |
| Graphological Services Intl 249 E 48th St # 5g, New York 10017 | (212) 755-7884 |
| Graphology Consulting Group 57 E 11th St, New York 10003 | (212) 822-8898 |
| Graphology Consulting Group 648 Broadway, New York 10012 | (212) 387-8100 |
| Tytell Questioned Document Lab 116 Fulton St, New York 10038 | (212) 233-5333 |
| Roger G Rubin 29 W 65th St, New York 10023 | (212) 580-9808 |
| Jean Peetz 446 E 20th St # 2b, New York 10009 | (212) 228-4791 |
| Essay-911 115 Saint James Place, New York 32423 | (415) 324-9001 |