Brampton, Ontario--Anil Khatod, Nortel Networks Corp.'s chief marketing and strategy officer, has resigned. No successor has been named. Khatod, who assumed his current job in April after serving as president of global Internet solutions, had been viewed by some telecom industry watchers as a successor to CEO John Roth, who plans to retire next year. Khatod's departure follows that of other key executives at the troubled networking software developer, including chief technology officer Bill Hawe. Nortel's shares are trading in the $7 to $9 range, off a 52-week high of $89. In February, the company announced it was laying off 10,000 workers.