Tenk founded the Exceed group in 2000. He started his career as a lecturer at the University of Stellenbosch in Business Economics. His accounting and auditing career was initiated in Johannesburg where he completed his articles and also attained his CA (SA) qualification in 1980. Tenk's qualifications include, B.Com, Hons B. Compt (Applied Accountancy), M. Comm (Business Exconomics), Higher Teachers Diploma, ACIS and Post graduate Diploma in Valuation.

Amongst other positions which he has held, he was a partner at the auditing firm Pricewaterhouse and thereafter the Managing Director at the firm Loubser du Plessis in Stellenbosch, which he established.

He is a well respected authority in South Africa on Trust Law and Administration and frequently acts as guest speaker on several topics including trusts and taxation. Tenk sits on the boards of several unlisted companies in South Africa.