POWER OF ATTORNEY

City of Boston

Commonwealth of Massachusetts

With respect to each of Columbia Seligman Premium Technology Growth Fund, Inc.,
Tri-Continental Corporation, and any other closed-end investment company for
which Columbia Management Investment Advisers, LLC now or hereafter serves as
investment adviser, the undersigned hereby appoints Scott R. Plummer, Paul B.
Goucher, Christopher O. Petersen, Joseph D'Alessandro or Ryan C. Larrenaga,
attorney-in-fact and agent, with full power of substitution and resubstitution,
for in name and stead, to sign and file Forms 3, 4 and 5 (Initial Statement of
Beneficial Ownership of Securities, Statement of Changes in Beneficial
Ownership, and Annual Statement of Changes in Beneficial Ownership of
Securities promulgated under Section 16(a) of the Securities Exchange Act of
1934), or further amendments thereto, and any and all applications or other
documents to be filed with the Securities and Exchange Commission (the SEC)
pertaining thereto, including, but not limited to, such applications as may be
necessary to file electronically with the SEC, with full power and authority to
do and perform all acts and things requisite and necessary to be done on the
premises.

Dated the 14/th/ day of July, 2015

/s/ Clark R. Westmont
--------------------------
Clark R. Westmont