The singly (1s,$ns$)$^{3}$S$^{e}$, (1s,$np$)$^{3}$P$^{o}$, (1s,$nd$)$^{3}$D$^{e}$
excited states and the doubly $_{2}$(1,0)$_{n}^{+1}$S$^{e}$ and
$_{2}$(1,0)$_{n}^{-3}$S$^{e}$ $(n\leq10)$ autoionizing states of the helium
isoelectronic sequence are investigated using Modified Atomic Orbital Theory
(MAOT). Total energies up to $Z = 10$ and excitation energies with $Z = 2-5$
are presented and comparison with experimental and theoretical available results
indicates a good agreement. In addition, the method is applied in the calculation
of accurate results in very high $Z$ - He isoelectronic sequence with $11\leq Z\leq58$
and with $Z = 60,$ 70, 80, 90 and 92 for the (1s,$ns$)$^{1,3}$S$^{e}$,
(1s,$np$)$^{1,3}$P$^{o}$, (1s,$nd$)$^{1,3}$D$^{e}$, $_{2}$(1,0)$_{n}^{+1}$S$^{e}$
and $_{2}$(1,0)$_{n}^{-3}$S$^{e}$ $(n\leq7)$ excited states. The results obtained
for these high $Z$ - He isoelectronic sequence are in good agreement with double
sums over the complete hydrogen spectrum calculations [Ivanov and Safronova, Opt.
Spektrosk \textbf{75}, 506 (1993)].