Mackay, Caswell, & Callahan, P.C. Since 1961, Mackay, Caswell & Callahan, P. C. has represented clients with respect to IRS tax audits, FBAR disclosures, the OVDP, and more. Phone: (212) 281-6781 244 5th Ave, New York, NY 10001 United States Map Other Categories: Finance & Legal |