The environment of the putative massive black hole in the central engines
of AGN is studied by using existing observations from the entire wavelength
range (radio to 
-rays) as well as performing observations in the
X/ -ray region. Both -ray loud (blazars) and -ray
weak (quasars and Seyfert Galaxies) sources are studied. In blazars, the
multi-wavelength spectra of core-dominated flat spectrum radio-loud quasars
(FSRQ) were used to study properties of jets in AGN. In Seyferts, the UV
to soft -ray continuum is modelled in order to study the geometry
and physical conditions in the coronal regions of the black hole accretion
disc. ASCA observations of the Seyfert 2 galaxy NGC 7172 from May 1995
obtained by the group have been analysed. Combining them with the public
CGRO OSSE data for the broad band spectral fits, it was shown that the
spectrum cuts off at 
keV, supporting thermal
Comptonization as an origin of the hard X-ray continuum. The ASCA data
showed significant variability in the spectral index as compared with the
previous Ginga data. OSSE observations of the Seyfert 1 galaxy NGC 3516
from June-Oct 1997 obtained by the group were combined with public ASCA
data from 1994 and 1995. Model fitting showed that NGC 3516 have
properties fairly normal for Seyfert 1 galaxies, contrary to some previous
expectations. Simultaneous observations by RXTE and OSSE of our closest
Seyfert 2 galaxy, the Circinus Galaxy, were obtained by the group in Oct
and Nov 1998 for the purpose of studying the effects of the nuclear
molecular torus on the X-ray spectrum.